Split out audio debug recording from RenderProcessHostImpl.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 9eed3650ca494d3191d504b0ec6aa6be3d109f7f..e4d43a52387435d5c0e9b44fe83f1991e5bcd6ae 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -81,7 +81,7 @@ class Extension;
 namespace content {
 
 class AppCacheDispatcher;
-class AecDumpMessageFilter;
+class AudioDebugRecorder;
 class AudioInputMessageFilter;
 class AudioMessageFilter;
 class AudioRendererMixerManager;
@@ -533,7 +533,7 @@ class CONTENT_EXPORT RenderThreadImpl
   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
   // diagnostic audio data for WebRTC stored locally when enabled by the user in
   // chrome://webrtc-internals.
-  scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
+  scoped_refptr<AudioDebugRecorder> audio_debug_recorder_;
 
   // The count of RenderWidgets running through this thread.
   int widget_count_;