Move media/audio files into media namespace

media/audio/audio_input_volume_unittest.cc

Index: media/audio/audio_input_volume_unittest.cc
diff --git a/media/audio/audio_input_volume_unittest.cc b/media/audio/audio_input_volume_unittest.cc
index 99f4e8304830cc7e8e2c5a2ef377e77d9de2f96d..c49187ed6225007aa9348a6a289cb300c399783e 100644
--- a/media/audio/audio_input_volume_unittest.cc
+++ b/media/audio/audio_input_volume_unittest.cc
@@ -12,7 +12,8 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::win::ScopedCOMInitializer;
-using media::AudioDeviceNames;
+
+namespace media {
 
 class AudioInputVolumeTest : public ::testing::Test {
  protected:
@@ -157,3 +158,5 @@ TEST_F(AudioInputVolumeTest, InputVolumeTest) {
     ais->Close();
   }
 }
+
+}  // namespace media