Move media/audio files into media namespace

media/audio/linux/alsa_output_unittest.cc

Index: media/audio/linux/alsa_output_unittest.cc
diff --git a/media/audio/linux/alsa_output_unittest.cc b/media/audio/linux/alsa_output_unittest.cc
index ab9a654eda6ac93764f799b97cb1ae50012426ba..be605c186f4127a11d6eec54bb8d01707f37b159 100644
--- a/media/audio/linux/alsa_output_unittest.cc
+++ b/media/audio/linux/alsa_output_unittest.cc
@@ -29,6 +29,8 @@ using testing::StrictMock;
 using testing::StrEq;
 using testing::Unused;
 
+namespace media {
+
 class MockAlsaWrapper : public AlsaWrapper {
  public:
   MOCK_METHOD3(DeviceNameHint, int(int card,
@@ -824,3 +826,5 @@ TEST_F(AlsaPcmOutputStreamTest, ScheduleNextWrite_StopStream) {
   test_stream->TransitionTo(AlsaPcmOutputStream::kIsClosed);
   test_stream->Close();
 }
+
+}  // namespace media