Re-enables three WebRTC unit tests in content

content/browser/renderer_host/media/mock_media_observer.h

Index: content/browser/renderer_host/media/mock_media_observer.h
diff --git a/content/browser/renderer_host/media/mock_media_observer.h b/content/browser/renderer_host/media/mock_media_observer.h
index fc3734744ea56e5e1daa88f9f1b75517706bdf89..5f7fb847b3ce2b78388e4a901c9fc1d999ae7156 100644
--- a/content/browser/renderer_host/media/mock_media_observer.h
+++ b/content/browser/renderer_host/media/mock_media_observer.h
@@ -10,6 +10,7 @@
 #include "base/basictypes.h"
 #include "content/browser/media/media_internals.h"
 #include "content/public/browser/media_observer.h"
+#include "media/audio/audio_parameters.h"
 #include "media/base/media_log_event.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ -47,6 +48,10 @@ class MockMediaInternals : public MediaInternals {
                void(void* host, int stream_id));
   MOCK_METHOD3(OnSetAudioStreamPlaying,
                void(void* host, int stream_id, bool playing));
+  MOCK_METHOD4(OnAudioStreamCreated,
+               void(void* host, int stream_id,
+                    const media::AudioParameters& params,
+                    const std::string& input_device_id));
   MOCK_METHOD3(OnSetAudioStreamStatus,
                void(void* host, int stream_id, const std::string& status));
   MOCK_METHOD3(OnSetAudioStreamVolume,