Make IPC::Channel::Listener:OnMessageReceived have a return value indicating ...

chrome/common/child_thread.h

Index: chrome/common/child_thread.h
===================================================================
--- chrome/common/child_thread.h	(revision 70108)
+++ chrome/common/child_thread.h	(working copy)
@@ -74,7 +74,9 @@
   // Called when the process refcount is 0.
   void OnProcessFinalRelease();
 
-  virtual void OnControlMessageReceived(const IPC::Message& msg) { }
+  virtual bool OnControlMessageReceived(const IPC::Message& msg) {
+    return false;
+  }
   virtual void OnAskBeforeShutdown();
   virtual void OnShutdown();
 
@@ -92,7 +94,7 @@
   void Init();
 
   // IPC::Channel::Listener implementation:
-  virtual void OnMessageReceived(const IPC::Message& msg);
+  virtual bool OnMessageReceived(const IPC::Message& msg);
   virtual void OnChannelError();
 
   std::string channel_name_;