First step towards moving AudioDevice from content/ to media/audio.

content/browser/renderer_host/media/audio_renderer_host.cc

Index: content/browser/renderer_host/media/audio_renderer_host.cc
diff --git a/content/browser/renderer_host/media/audio_renderer_host.cc b/content/browser/renderer_host/media/audio_renderer_host.cc
index c59ef4452b03e4df9ce2c0db6521ea10b1cf2b08..f84ff4e0717a6dac95dd553614d228d37db092c4 100644
--- a/content/browser/renderer_host/media/audio_renderer_host.cc
+++ b/content/browser/renderer_host/media/audio_renderer_host.cc
@@ -147,7 +147,7 @@ void AudioRendererHost::DoSendPlayingMessage(
     return;
 
   Send(new AudioMsg_NotifyStreamStateChanged(
-    entry->stream_id, kAudioStreamPlaying));
+      entry->stream_id, media::AudioDeviceIPCDelegate::kPlaying));
 }
 
 void AudioRendererHost::DoSendPausedMessage(
@@ -159,7 +159,7 @@ void AudioRendererHost::DoSendPausedMessage(
     return;
 
   Send(new AudioMsg_NotifyStreamStateChanged(
-      entry->stream_id, kAudioStreamPaused));
+      entry->stream_id, media::AudioDeviceIPCDelegate::kPaused));
 }
 
 void AudioRendererHost::DoHandleError(media::AudioOutputController* controller,
@@ -312,7 +312,8 @@ void AudioRendererHost::OnSetVolume(int stream_id, double volume) {
 }
 
 void AudioRendererHost::SendErrorMessage(int32 stream_id) {
-  Send(new AudioMsg_NotifyStreamStateChanged(stream_id, kAudioStreamError));
+  Send(new AudioMsg_NotifyStreamStateChanged(
+      stream_id, media::AudioDeviceIPCDelegate::kError));
 }
 
 void AudioRendererHost::DeleteEntries() {