--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -108,25 +108,25 @@ public:
     MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
            ("AudioPlaybackRunnable, active = %s, reason = %s\n",
             mActive ? "true" : "false", AudibleChangedReasonToStr(mReason)));
 
     return NS_OK;
   }
 
 private:
-  void GetActiveState(nsAString& astate)
+  void GetActiveState(nsAString& aState)
   {
     if (mActive) {
-      CopyASCIItoUTF16("active", astate);
+      aState.AssignLiteral("active");
     } else {
       if(mReason == AudioChannelService::AudibleChangedReasons::ePauseStateChanged) {
-        CopyASCIItoUTF16("inactive-pause", astate);
+        aState.AssignLiteral("inactive-pause");
       } else {
-        CopyASCIItoUTF16("inactive-nonaudible", astate);
+        aState.AssignLiteral("inactive-nonaudible");
       }
     }
   }
 
   nsCOMPtr<nsPIDOMWindowOuter> mWindow;
   bool mActive;
   AudioChannelService::AudibleChangedReasons mReason;
 };