Simplify message parsing.

remoting/protocol/host_video_dispatcher.h

Index: remoting/protocol/host_video_dispatcher.h
diff --git a/remoting/protocol/host_video_dispatcher.h b/remoting/protocol/host_video_dispatcher.h
index 323ddb76bfef39722c6d8e5201fcaac29c7328e7..1e61540420a2778df53800e8e2aa45d19d7b87c6 100644
--- a/remoting/protocol/host_video_dispatcher.h
+++ b/remoting/protocol/host_video_dispatcher.h
@@ -7,9 +7,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "remoting/proto/video.pb.h"
 #include "remoting/protocol/channel_dispatcher_base.h"
-#include "remoting/protocol/protobuf_message_parser.h"
 #include "remoting/protocol/video_stub.h"
 
 namespace remoting {
@@ -31,11 +29,9 @@ class HostVideoDispatcher : public ChannelDispatcherBase, public VideoStub {
                           const base::Closure& done) override;
 
  private:
-  void OnVideoAck(scoped_ptr<VideoAck> ack);
+  void OnIncomingMessage(scoped_ptr<CompoundBuffer> message) override;
 
-  ProtobufMessageParser<VideoAck> parser_;
-
-  VideoFeedbackStub* video_feedback_stub_;
+  VideoFeedbackStub* video_feedback_stub_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(HostVideoDispatcher);
 };