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 63b418702f2766be47af2cc81bff8c07fcdf2137..41127627484e2910cd9bad0e835358ca9ed3c49c 100644
--- a/content/renderer/media/rtc_peer_connection_handler_unittest.cc
+++ b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
@@ -301,10 +301,10 @@ class RTCPeerConnectionHandlerTest : public ::testing::Test {
                              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;
@@ -371,6 +371,10 @@ class RTCPeerConnectionHandlerTest : public ::testing::Test {
       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_;
   std::unique_ptr<MockWebRTCPeerConnectionHandlerClient> mock_client_;