Revert of Fix getUserMedia so that failure is reported for invalid audio sources.

content/renderer/media/rtc_peer_connection_handler_unittest.cc

Index: content/renderer/media/rtc_peer_connection_handler_unittest.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler_unittest.cc b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
index 680d16d153f48cb2cea39f05f98b8fad0e785d73..7745960a5b00f8546734770256b27d322032f005 100644
--- a/content/renderer/media/rtc_peer_connection_handler_unittest.cc
+++ b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
@@ -296,10 +296,10 @@
                              media::AudioParameters::kAudioCDSampleRate,
                              media::CHANNEL_LAYOUT_STEREO,
                              media::AudioParameters::kAudioCDSampleRate / 100),
-            MockConstraintFactory().CreateWebMediaConstraints(),
-            base::Bind(&RTCPeerConnectionHandlerTest::OnAudioSourceStarted),
             mock_dependency_factory_.get());
     audio_source->SetAllowInvalidRenderFrameIdForTesting(true);
+    audio_source->SetSourceConstraints(
+        MockConstraintFactory().CreateWebMediaConstraints());
     blink_audio_source.setExtraData(audio_source);  // Takes ownership.
 
     blink::WebMediaStreamSource video_source;
@@ -365,10 +365,6 @@
     for (const auto& track : video_tracks)
       MediaStreamVideoTrack::GetVideoTrack(track)->Stop();
   }
-
-  static void OnAudioSourceStarted(MediaStreamSource* source,
-                                   MediaStreamRequestResult result,
-                                   const blink::WebString& result_name) {}
 
   base::MessageLoop message_loop_;
   std::unique_ptr<ChildProcess> child_process_;