Move media/audio files into media namespace

media/audio/mac/audio_output_mac_unittest.cc

Index: media/audio/mac/audio_output_mac_unittest.cc
diff --git a/media/audio/mac/audio_output_mac_unittest.cc b/media/audio/mac/audio_output_mac_unittest.cc
index 71a7f404f96cb84aee41f9b380400d8863e681ad..0724883e8c10381c04a0ed94d243a678fada25df 100644
--- a/media/audio/mac/audio_output_mac_unittest.cc
+++ b/media/audio/mac/audio_output_mac_unittest.cc
@@ -20,6 +20,8 @@ using ::testing::NiceMock;
 using ::testing::NotNull;
 using ::testing::Return;
 
+namespace media {
+
 class MockAudioSource : public AudioOutputStream::AudioSourceCallback {
  public:
   MOCK_METHOD4(OnMoreData, uint32(AudioOutputStream* stream, uint8* dest,
@@ -175,3 +177,5 @@ TEST(MacAudioTest, PCMWaveStreamPendingBytes) {
   oas->Stop();
   oas->Close();
 }
+
+}  // namespace media