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

chrome/worker/websharedworker_stub.cc

Index: chrome/worker/websharedworker_stub.cc
===================================================================
--- chrome/worker/websharedworker_stub.cc	(revision 70108)
+++ chrome/worker/websharedworker_stub.cc	(working copy)
@@ -26,13 +26,16 @@
   impl_->clientDestroyed();
 }
 
-void WebSharedWorkerStub::OnMessageReceived(const IPC::Message& message) {
+bool WebSharedWorkerStub::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(WebSharedWorkerStub, message)
     IPC_MESSAGE_HANDLER(WorkerMsg_StartWorkerContext, OnStartWorkerContext)
     IPC_MESSAGE_HANDLER(WorkerMsg_TerminateWorkerContext,
                         OnTerminateWorkerContext)
     IPC_MESSAGE_HANDLER(WorkerMsg_Connect, OnConnect)
+    IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+  return handled;
 }
 
 void WebSharedWorkerStub::OnChannelError() {