Introduce content::ChildMessageFilter.

content/renderer/media/android/renderer_demuxer_android.h

Index: content/renderer/media/android/renderer_demuxer_android.h
diff --git a/content/renderer/media/android/renderer_demuxer_android.h b/content/renderer/media/android/renderer_demuxer_android.h
index c6538a1b2cb6c0ba589c29618c11f0cfe9d85d79..3455e13a382ef724b48a509522b63e524ff7529b 100644
--- a/content/renderer/media/android/renderer_demuxer_android.h
+++ b/content/renderer/media/android/renderer_demuxer_android.h
@@ -7,19 +7,18 @@
 
 #include "base/atomic_sequence_num.h"
 #include "base/id_map.h"
-#include "ipc/ipc_channel_proxy.h"
+#include "content/child/child_message_filter.h"
 #include "media/base/android/demuxer_stream_player_params.h"
 
 namespace content {
 
 class MediaSourceDelegate;
-class ThreadSafeSender;
 
 // Represents the renderer process half of an IPC-based implementation of
 // media::DemuxerAndroid.
 //
 // Refer to BrowserDemuxerAndroid for the browser process half.
-class RendererDemuxerAndroid : public IPC::ChannelProxy::MessageFilter {
+class RendererDemuxerAndroid : public ChildMessageFilter {
  public:
   RendererDemuxerAndroid();
 
@@ -39,7 +38,9 @@ class RendererDemuxerAndroid : public IPC::ChannelProxy::MessageFilter {
   // Must be called on media thread.
   void RemoveDelegate(int demuxer_client_id);
 
-  // IPC::ChannelProxy::MessageFilter overrides.
+  // ChildMessageFilter overrides.
+  virtual base::TaskRunner* OverrideTaskRunnerForMessage(
+      const IPC::Message& message) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // media::DemuxerAndroidClient "implementation".
@@ -60,7 +61,6 @@ class RendererDemuxerAndroid : public IPC::ChannelProxy::MessageFilter {
   virtual ~RendererDemuxerAndroid();
 
  private:
-  void DispatchMessage(const IPC::Message& message);
   void OnReadFromDemuxer(int demuxer_client_id,
                          media::DemuxerStream::Type type);
   void OnDemuxerSeekRequest(int demuxer_client_id,
@@ -71,7 +71,6 @@ class RendererDemuxerAndroid : public IPC::ChannelProxy::MessageFilter {
   base::AtomicSequenceNumber next_demuxer_client_id_;
 
   IDMap<MediaSourceDelegate> delegates_;
-  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<base::MessageLoopProxy> media_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererDemuxerAndroid);