Unmute Tab Audio For Desktop Share

content/browser/media/capture/web_contents_audio_muter.cc

Index: content/browser/media/capture/web_contents_audio_muter.cc
diff --git a/content/browser/media/capture/web_contents_audio_muter.cc b/content/browser/media/capture/web_contents_audio_muter.cc
index e99c768d4bcf3779e8e15e38843b0a031afbf0dc..8512b2a6aa69eec9b0a3f732e7b4225735523007 100644
--- a/content/browser/media/capture/web_contents_audio_muter.cc
+++ b/content/browser/media/capture/web_contents_audio_muter.cc
@@ -112,6 +112,14 @@ class WebContentsAudioMuter::MuteDestination
     return new AudioDiscarder(params);
   }
 
+  media::AudioPushSink* AddPushInput(
+      const media::AudioParameters& params) override {
+    NOTREACHED();
+    return nullptr;
+  }
+
+  bool IsDuplication() override { return false; }
+
   WebContents* const web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(MuteDestination);