Simplify message parsing.

remoting/protocol/channel_dispatcher_base.h

Index: remoting/protocol/channel_dispatcher_base.h
diff --git a/remoting/protocol/channel_dispatcher_base.h b/remoting/protocol/channel_dispatcher_base.h
index 06d2c79f533e3f7d324eada10f0b2611d5e965db..eca2d12d9892e4962e7b059cf857ddcf2481479c 100644
--- a/remoting/protocol/channel_dispatcher_base.h
+++ b/remoting/protocol/channel_dispatcher_base.h
@@ -55,7 +55,9 @@ class ChannelDispatcherBase {
   explicit ChannelDispatcherBase(const char* channel_name);
 
   BufferedSocketWriter* writer() { return &writer_; }
-  MessageReader* reader() { return &reader_; }
+
+  // Child classes must override this method to handle incoming messages.
+  virtual void OnIncomingMessage(scoped_ptr<CompoundBuffer> message) = 0;
 
  private:
   void OnChannelReady(scoped_ptr<P2PStreamSocket> socket);