Changed the interface AudioMixer::RemoveSource to have a void return type.

webrtc/api/audio/audio_mixer.h

Index: webrtc/api/audio/audio_mixer.h
diff --git a/webrtc/api/audio/audio_mixer.h b/webrtc/api/audio/audio_mixer.h
index dbb58ca74a557018612ae3ee0538e7f7b304a77c..d7e7fdd6284786681cc069bb1e2b532b4ba2efbe 100644
--- a/webrtc/api/audio/audio_mixer.h
+++ b/webrtc/api/audio/audio_mixer.h
@@ -51,12 +51,12 @@ class AudioMixer : public rtc::RefCountInterface {
     virtual ~Source() {}
   };
 
-  // Returns true if adding/removing was successful. A source is never
-  // added twice and removal is never attempted if a source has not
-  // been successfully added to the mixer. Addition and removal can
-  // happen on different threads.
+  // Returns true if adding was successful. A source is never added
+  // twice and removal is never attempted if a source has not been
+  // successfully added to the mixer. Addition and removal can happen
+  // on different threads.

[kwiberg-webrtc, 2016/11/18 02:10:12]

It probably makes more sense to document these two separately now.

   virtual bool AddSource(Source* audio_source) = 0;
-  virtual bool RemoveSource(Source* audio_source) = 0;
+  virtual void RemoveSource(Source* audio_source) = 0;
 
   // Performs mixing by asking registered audio sources for audio. The
   // mixed result is placed in the provided AudioFrame. This method