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

chrome/ppapi_plugin/ppapi_thread.cc

Index: chrome/ppapi_plugin/ppapi_thread.cc
===================================================================
--- chrome/ppapi_plugin/ppapi_thread.cc	(revision 70108)
+++ chrome/ppapi_plugin/ppapi_thread.cc	(working copy)
@@ -35,7 +35,7 @@
 // Note that this function is called only for messages from the channel to the
 // browser process. Messages from the renderer process are sent via a different
 // channel that ends up at Dispatcher::OnMessageReceived.
-void PpapiThread::OnMessageReceived(const IPC::Message& msg) {
+bool PpapiThread::OnMessageReceived(const IPC::Message& msg) {
   IPC_BEGIN_MESSAGE_MAP(PpapiThread, msg)
     IPC_MESSAGE_HANDLER(PpapiMsg_LoadPlugin, OnMsgLoadPlugin)
 
@@ -45,6 +45,7 @@
         dispatcher_->OnMessageReceived(msg)
     )*/
   IPC_END_MESSAGE_MAP()
+  return true;
 }
 
 void PpapiThread::OnMsgLoadPlugin(base::ProcessHandle host_process_handle,