--- a/widget/windows/TSFTextStore.cpp
+++ b/widget/windows/TSFTextStore.cpp
@@ -1186,17 +1186,17 @@ TSFTextStore::TSFTextStore()
   , mHandlingKeyMessage(0)
   , mContentForTSF(mComposition, mSelection)
   , mRequestedAttrValues(false)
   , mIsRecordingActionsWithoutLock(false)
   , mPendingOnSelectionChange(false)
   , mHasReturnedNoLayoutError(false)
   , mWaitingQueryLayout(false)
   , mPendingDestroy(false)
-  , mDeferClearingLockedContent(false)
+  , mDeferClearingContentForTSF(false)
   , mNativeCaretIsCreated(false)
   , mDeferNotifyingTSF(false)
   , mDeferCommittingComposition(false)
   , mDeferCancellingComposition(false)
   , mDestroyed(false)
   , mBeingDestroyed(false)
 {
   for (int32_t i = 0; i < NUM_OF_SUPPORTED_ATTRS; i++) {
@@ -1660,29 +1660,29 @@ TSFTextStore::FlushPendingActions()
                     "FAILED due to eSetSelection failure", this));
             break;
           }
         }
 
         // eCompositionStart always causes
         // NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED.  Therefore, we should
         // wait to clear the locked content until it's notified.
-        mDeferClearingLockedContent = true;
+        mDeferClearingContentForTSF = true;
 
         MOZ_LOG(sTextStoreLog, LogLevel::Debug,
                ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
                 "dispatching compositionstart event...", this));
         WidgetEventTime eventTime = mWidget->CurrentMessageWidgetEventTime();
         nsEventStatus status;
         rv = mDispatcher->StartComposition(status, &eventTime);
         if (NS_WARN_IF(NS_FAILED(rv))) {
           MOZ_LOG(sTextStoreLog, LogLevel::Error,
             ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
              "FAILED to dispatch compositionstart event.", this));
-          mDeferClearingLockedContent = false;
+          mDeferClearingContentForTSF = false;
         }
         if (!mWidget || mWidget->Destroyed()) {
           break;
         }
         break;
       }
       case PendingAction::COMPOSITION_UPDATE: {
         MOZ_LOG(sTextStoreLog, LogLevel::Debug,
@@ -1691,65 +1691,65 @@ TSFTextStore::FlushPendingActions()
                 "mRanges=0x%p, mRanges->Length()=%d }",
                 this, NS_ConvertUTF16toUTF8(action.mData).get(), action.mRanges.get(),
                 action.mRanges ? action.mRanges->Length() : 0));
 
         // eCompositionChange causes a DOM text event, the IME will be notified
         // of NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED.  In this case, we
         // should not clear the locked content until we notify the IME of the
         // composition update.
-        mDeferClearingLockedContent = true;
+        mDeferClearingContentForTSF = true;
 
         rv = mDispatcher->SetPendingComposition(action.mData,
                                                 action.mRanges);
         if (NS_WARN_IF(NS_FAILED(rv))) {
           MOZ_LOG(sTextStoreLog, LogLevel::Error,
             ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
              "FAILED to setting pending composition...", this));
-          mDeferClearingLockedContent = false;
+          mDeferClearingContentForTSF = false;
         } else {
           MOZ_LOG(sTextStoreLog, LogLevel::Debug,
             ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
              "dispatching compositionchange event...", this));
           WidgetEventTime eventTime = mWidget->CurrentMessageWidgetEventTime();
           nsEventStatus status;
           rv = mDispatcher->FlushPendingComposition(status, &eventTime);
           if (NS_WARN_IF(NS_FAILED(rv))) {
             MOZ_LOG(sTextStoreLog, LogLevel::Error,
               ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
                "FAILED to dispatch compositionchange event.", this));
-            mDeferClearingLockedContent = false;
+            mDeferClearingContentForTSF = false;
           }
           // Be aware, the mWidget might already have been destroyed.
         }
         break;
       }
       case PendingAction::COMPOSITION_END: {
         MOZ_LOG(sTextStoreLog, LogLevel::Debug,
                ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
                 "flushing COMPOSITION_END={ mData=\"%s\" }",
                 this, NS_ConvertUTF16toUTF8(action.mData).get()));
 
         // Dispatching eCompositionCommit causes a DOM text event, then,
         // the IME will be notified of NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED.
         // In this case, we should not clear the locked content until we notify
         // the IME of the composition update.
-        mDeferClearingLockedContent = true;
+        mDeferClearingContentForTSF = true;
 
         MOZ_LOG(sTextStoreLog, LogLevel::Debug,
                ("TSF: 0x%p   TSFTextStore::FlushPendingActions(), "
                 "dispatching compositioncommit event...", this));
         WidgetEventTime eventTime = mWidget->CurrentMessageWidgetEventTime();
         nsEventStatus status;
         rv = mDispatcher->CommitComposition(status, &action.mData, &eventTime);
         if (NS_WARN_IF(NS_FAILED(rv))) {
           MOZ_LOG(sTextStoreLog, LogLevel::Error,
             ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
              "FAILED to dispatch compositioncommit event.", this));
-          mDeferClearingLockedContent = false;
+          mDeferClearingContentForTSF = false;
         }
         break;
       }
       case PendingAction::SET_SELECTION: {
         MOZ_LOG(sTextStoreLog, LogLevel::Debug,
                ("TSF: 0x%p   TSFTextStore::FlushPendingActions() "
                 "flushing SET_SELECTION={ mSelectionStart=%d, "
                 "mSelectionLength=%d, mSelectionReversed=%s }, "
@@ -1832,17 +1832,17 @@ TSFTextStore::MaybeFlushPendingNotificat
     // If it's already been destroyed completely, this shouldn't notify TSF of
     // anything anymore.
     MOZ_LOG(sTextStoreLog, LogLevel::Debug,
       ("TSF: 0x%p   TSFTextStore::MaybeFlushPendingNotifications(), "
        "does nothing because this has already destroyed completely...", this));
     return;
   }
 
-  if (!mDeferClearingLockedContent && mContentForTSF.IsInitialized()) {
+  if (!mDeferClearingContentForTSF && mContentForTSF.IsInitialized()) {
     mContentForTSF.Clear();
     MOZ_LOG(sTextStoreLog, LogLevel::Debug,
            ("TSF: 0x%p   TSFTextStore::MaybeFlushPendingNotifications(), "
             "mContentForTSF is cleared", this));
   }
 
   if (mHasReturnedNoLayoutError) {
     MOZ_LOG(sTextStoreLog, LogLevel::Info,
@@ -2010,19 +2010,19 @@ TSFTextStore::ContentForTSFRef()
               "GetCurrentText() failure", this));
       mContentForTSF.Clear();
       return mContentForTSF;
     }
 
     mContentForTSF.Init(text);
     // Basically, the locked content should be cleared after the document is
     // unlocked.  However, in e10s mode, content will be modified
-    // asynchronously.  In such case, mDeferClearingLockedContent may be
+    // asynchronously.  In such case, mDeferClearingContentForTSF may be
     // true even after the document is unlocked.
-    mDeferClearingLockedContent = false;
+    mDeferClearingContentForTSF = false;
   }
 
   MOZ_LOG(sTextStoreLog, LogLevel::Debug,
          ("TSF: 0x%p   TSFTextStore::ContentForTSFRef(): "
           "mContentForTSF={ mText=\"%s\" (Length()=%u), "
           "mLastCompositionString=\"%s\" (Length()=%u), "
           "mMinTextModifiedOffset=%u }",
           this, mContentForTSF.Text().Length() <= 20 ?
@@ -4985,17 +4985,17 @@ TSFTextStore::OnUpdateCompositionInterna
 
   // There are nothing to do after destroyed.
   if (mDestroyed) {
     return NS_OK;
   }
 
   // Now, all sent composition events are handled by the content even in
   // e10s mode.
-  mDeferClearingLockedContent = false;
+  mDeferClearingContentForTSF = false;
   mDeferNotifyingTSF = false;
   MaybeFlushPendingNotifications();
   return NS_OK;
 }
 
 nsresult
 TSFTextStore::OnMouseButtonEventInternal(
                 const IMENotification& aIMENotification)

--- a/widget/windows/TSFTextStore.h
+++ b/widget/windows/TSFTextStore.h
@@ -881,17 +881,17 @@ protected:
   // true.  This is set to  false when GetTextExt() or GetACPFromPoint() is
   // called.
   bool                         mWaitingQueryLayout;
   // During the documet is locked, we shouldn't destroy the instance.
   // If this is true, the instance will be destroyed after unlocked.
   bool                         mPendingDestroy;
   // If this is false, MaybeFlushPendingNotifications() will clear the
   // mContentForTSF.
-  bool                         mDeferClearingLockedContent;
+  bool                         mDeferClearingContentForTSF;
   // While there is native caret, this is true.  Otherwise, false.
   bool                         mNativeCaretIsCreated;
   // While the instance is dispatching events, the event may not be handled
   // synchronously in e10s mode.  So, in such case, in strictly speaking,
   // we shouldn't query layout information.  However, TS_E_NOLAYOUT bugs of
   // ITextStoreAPC::GetTextExt() blocks us to behave ideally.
   // For preventing it to be called, we should put off notifying TSF of
   // anything until layout information becomes available.