Move media/audio files into media namespace (relanding)

media/audio/android/opensles_input.cc

Index: media/audio/android/opensles_input.cc
diff --git a/media/audio/android/opensles_input.cc b/media/audio/android/opensles_input.cc
index 32c68e1ec679f05aad14246d06c444dda8053bc2..7a503afdbc3ab8253dcbd98786922dc06c61984c 100644
--- a/media/audio/android/opensles_input.cc
+++ b/media/audio/android/opensles_input.cc
@@ -7,6 +7,8 @@
 #include "base/logging.h"
 #include "media/audio/android/audio_manager_android.h"
 
+namespace media {
+
 OpenSLESInputStream::OpenSLESInputStream(AudioManagerAndroid* audio_manager,
                                          const AudioParameters& params)
     : audio_manager_(audio_manager),
@@ -288,3 +290,5 @@ void OpenSLESInputStream::HandleError(SLresult error) {
   if (callback_)
     callback_->OnError(this, error);
 }
+
+}  // namespace media