Replace AudioSilenceDetector with an AudioPowerMonitor.

media/audio/audio_output_controller_unittest.cc

Index: media/audio/audio_output_controller_unittest.cc
diff --git a/media/audio/audio_output_controller_unittest.cc b/media/audio/audio_output_controller_unittest.cc
index c6c2d4572a05d935c2428c1a5ac844b9dcadeccf..a09fd03ad9af6f77b23152e529cb5b769b53b6d1 100644
--- a/media/audio/audio_output_controller_unittest.cc
+++ b/media/audio/audio_output_controller_unittest.cc
@@ -40,7 +40,7 @@ class MockAudioOutputControllerEventHandler
 
   MOCK_METHOD0(OnCreated, void());
   MOCK_METHOD0(OnPlaying, void());
-  MOCK_METHOD1(OnAudible, void(bool is_audible));
+  MOCK_METHOD1(OnPowerMeasured, void(float power_in_dbfs));
   MOCK_METHOD0(OnPaused, void());
   MOCK_METHOD0(OnError, void());
   MOCK_METHOD2(OnDeviceChange, void(int new_buffer_size, int new_sample_rate));
@@ -132,10 +132,10 @@ class AudioOutputControllerTest : public testing::Test {
 
   void Play() {
     // Expect the event handler to receive one OnPlaying() call and one or more
-    // OnAudible() calls.
+    // OnPowerMeasured() calls.
     EXPECT_CALL(mock_event_handler_, OnPlaying())
         .WillOnce(SignalEvent(&play_event_));
-    EXPECT_CALL(mock_event_handler_, OnAudible(_))
+    EXPECT_CALL(mock_event_handler_, OnPowerMeasured(_))
         .Times(AtLeast(1));
 
     // During playback, the mock pretends to provide audio data rendered and