Move media/audio files into media namespace

media/audio/audio_parameters.h

Index: media/audio/audio_parameters.h
diff --git a/media/audio/audio_parameters.h b/media/audio/audio_parameters.h
index 6b3ed5c31b4cce6d3443be087e989decb8b6b842..a2b01788d87932f1e2c42ba71755116bfec40546 100644
--- a/media/audio/audio_parameters.h
+++ b/media/audio/audio_parameters.h
@@ -9,6 +9,8 @@
 #include "media/base/channel_layout.h"
 #include "media/base/media_export.h"
 
+namespace media {
+
 class MEDIA_EXPORT AudioParameters {
  public:
   // Compare is useful when AudioParameters is used as a key in std::map.
@@ -70,4 +72,6 @@ class MEDIA_EXPORT AudioParameters {
                                   // |channel_layout|.
 };
 
+}  // namespace media
+
 #endif  // MEDIA_AUDIO_AUDIO_PARAMETERS_H_