--- a/layout/base/RestyleManager.cpp
+++ b/layout/base/RestyleManager.cpp
@@ -3906,77 +3906,16 @@ RestyleManager::StructsToLog()
     initialized = true;
   }
   return structs;
 }
 #endif
 
 #ifdef DEBUG
 /* static */ nsCString
-RestyleManager::ChangeHintToString(nsChangeHint aHint)
-{
-  nsCString result;
-  bool any = false;
-  const char* names[] = {
-    "RepaintFrame", "NeedReflow", "ClearAncestorIntrinsics",
-    "ClearDescendantIntrinsics", "NeedDirtyReflow", "SyncFrameView",
-    "UpdateCursor", "UpdateEffects", "UpdateOpacityLayer",
-    "UpdateTransformLayer", "ReconstructFrame", "UpdateOverflow",
-    "UpdateSubtreeOverflow", "UpdatePostTransformOverflow",
-    "UpdateParentOverflow",
-    "ChildrenOnlyTransform", "RecomputePosition", "AddOrRemoveTransform",
-    "BorderStyleNoneChange", "UpdateTextPath", "SchedulePaint",
-    "NeutralChange", "InvalidateRenderingObservers",
-    "ReflowChangesSizeOrPosition", "UpdateComputedBSize",
-    "UpdateUsesOpacity"
-  };
-  uint32_t hint = aHint & ((1 << ArrayLength(names)) - 1);
-  uint32_t rest = aHint & ~((1 << ArrayLength(names)) - 1);
-  if (hint == nsChangeHint_Hints_NotHandledForDescendants) {
-    result.AppendLiteral("nsChangeHint_Hints_NotHandledForDescendants");
-    hint = 0;
-    any = true;
-  } else {
-    if ((hint & NS_STYLE_HINT_REFLOW) == NS_STYLE_HINT_REFLOW) {
-      result.AppendLiteral("NS_STYLE_HINT_REFLOW");
-      hint = hint & ~NS_STYLE_HINT_REFLOW;
-      any = true;
-    } else if ((hint & nsChangeHint_AllReflowHints) == nsChangeHint_AllReflowHints) {
-      result.AppendLiteral("nsChangeHint_AllReflowHints");
-      hint = hint & ~nsChangeHint_AllReflowHints;
-      any = true;
-    } else if ((hint & NS_STYLE_HINT_VISUAL) == NS_STYLE_HINT_VISUAL) {
-      result.AppendLiteral("NS_STYLE_HINT_VISUAL");
-      hint = hint & ~NS_STYLE_HINT_VISUAL;
-      any = true;
-    }
-  }
-  for (uint32_t i = 0; i < ArrayLength(names); i++) {
-    if (hint & (1 << i)) {
-      if (any) {
-        result.AppendLiteral(" | ");
-      }
-      result.AppendPrintf("nsChangeHint_%s", names[i]);
-      any = true;
-    }
-  }
-  if (rest) {
-    if (any) {
-      result.AppendLiteral(" | ");
-    }
-    result.AppendPrintf("0x%0x", rest);
-  } else {
-    if (!any) {
-      result.AppendLiteral("nsChangeHint(0)");
-    }
-  }
-  return result;
-}
-
-/* static */ nsCString
 RestyleManager::StructNamesToString(uint32_t aSIDs)
 {
   nsCString result;
   bool any = false;
   for (nsStyleStructID sid = nsStyleStructID(0);
        sid < nsStyleStructID_Length;
        sid = nsStyleStructID(sid + 1)) {
     if (aSIDs & nsCachedStyleData::GetBitForSID(sid)) {

--- a/layout/base/RestyleManager.h
+++ b/layout/base/RestyleManager.h
@@ -375,20 +375,16 @@ public:
                         nsChangeHint aMinChangeHint,
                         const RestyleHintData* aRestyleHintData = nullptr);
 
   void PostRestyleEventForLazyConstruction()
   {
     PostRestyleEventInternal(true);
   }
 
-#ifdef DEBUG
-  static nsCString ChangeHintToString(nsChangeHint aHint);
-#endif
-
 public:
   /**
    * Asynchronously clear style data from the root frame downwards and ensure
    * it will all be rebuilt. This is safe to call anytime; it will schedule
    * a restyle and take effect next time style changes are flushed.
    * This method is used to recompute the style data when some change happens
    * outside of any style rules, like a color preference change or a change
    * in a system font size, or to fix things up when an optimization in the

--- a/layout/base/RestyleManagerBase.cpp
+++ b/layout/base/RestyleManagerBase.cpp
@@ -131,16 +131,79 @@ RestyleManagerBase::RestyleHintToString(
   } else {
     if (!any) {
       result.AppendLiteral("0");
     }
   }
   return result;
 }
 
+#ifdef DEBUG
+/* static */ nsCString
+RestyleManagerBase::ChangeHintToString(nsChangeHint aHint)
+{
+  nsCString result;
+  bool any = false;
+  const char* names[] = {
+    "RepaintFrame", "NeedReflow", "ClearAncestorIntrinsics",
+    "ClearDescendantIntrinsics", "NeedDirtyReflow", "SyncFrameView",
+    "UpdateCursor", "UpdateEffects", "UpdateOpacityLayer",
+    "UpdateTransformLayer", "ReconstructFrame", "UpdateOverflow",
+    "UpdateSubtreeOverflow", "UpdatePostTransformOverflow",
+    "UpdateParentOverflow",
+    "ChildrenOnlyTransform", "RecomputePosition", "AddOrRemoveTransform",
+    "BorderStyleNoneChange", "UpdateTextPath", "SchedulePaint",
+    "NeutralChange", "InvalidateRenderingObservers",
+    "ReflowChangesSizeOrPosition", "UpdateComputedBSize",
+    "UpdateUsesOpacity"
+  };
+  uint32_t hint = aHint & ((1 << ArrayLength(names)) - 1);
+  uint32_t rest = aHint & ~((1 << ArrayLength(names)) - 1);
+  if (hint == nsChangeHint_Hints_NotHandledForDescendants) {
+    result.AppendLiteral("nsChangeHint_Hints_NotHandledForDescendants");
+    hint = 0;
+    any = true;
+  } else {
+    if ((hint & NS_STYLE_HINT_REFLOW) == NS_STYLE_HINT_REFLOW) {
+      result.AppendLiteral("NS_STYLE_HINT_REFLOW");
+      hint = hint & ~NS_STYLE_HINT_REFLOW;
+      any = true;
+    } else if ((hint & nsChangeHint_AllReflowHints) == nsChangeHint_AllReflowHints) {
+      result.AppendLiteral("nsChangeHint_AllReflowHints");
+      hint = hint & ~nsChangeHint_AllReflowHints;
+      any = true;
+    } else if ((hint & NS_STYLE_HINT_VISUAL) == NS_STYLE_HINT_VISUAL) {
+      result.AppendLiteral("NS_STYLE_HINT_VISUAL");
+      hint = hint & ~NS_STYLE_HINT_VISUAL;
+      any = true;
+    }
+  }
+  for (uint32_t i = 0; i < ArrayLength(names); i++) {
+    if (hint & (1 << i)) {
+      if (any) {
+        result.AppendLiteral(" | ");
+      }
+      result.AppendPrintf("nsChangeHint_%s", names[i]);
+      any = true;
+    }
+  }
+  if (rest) {
+    if (any) {
+      result.AppendLiteral(" | ");
+    }
+    result.AppendPrintf("0x%0x", rest);
+  } else {
+    if (!any) {
+      result.AppendLiteral("nsChangeHint(0)");
+    }
+  }
+  return result;
+}
+#endif
+
 void
 RestyleManagerBase::PostRestyleEventInternal(bool aForLazyConstruction)
 {
   // Make sure we're not in a style refresh; if we are, we still have
   // a call to ProcessPendingRestyles coming and there's no need to
   // add ourselves as a refresh observer until then.
   bool inRefresh = !aForLazyConstruction && mInStyleRefresh;
   nsIPresShell* presShell = PresContext()->PresShell();

--- a/layout/base/RestyleManagerBase.h
+++ b/layout/base/RestyleManagerBase.h
@@ -43,16 +43,18 @@ public:
       mObservingRefreshDriver = aObserving;
   }
 
   void Disconnect() { mPresContext = nullptr; }
 
   static nsCString RestyleHintToString(nsRestyleHint aHint);
 
 #ifdef DEBUG
+  static nsCString ChangeHintToString(nsChangeHint aHint);
+
   /**
    * DEBUG ONLY method to verify integrity of style tree versus frame tree
    */
   static void DebugVerifyStyleTree(nsIFrame* aFrame);
 #endif
 
   void FlushOverflowChangedTracker() {
     mOverflowChangedTracker.Flush();