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

chrome/browser/utility_process_host.cc

Index: chrome/browser/utility_process_host.cc
===================================================================
--- chrome/browser/utility_process_host.cc	(revision 70108)
+++ chrome/browser/utility_process_host.cc	(working copy)
@@ -153,10 +153,11 @@
   return true;
 }
 
-void UtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
+bool UtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
   BrowserThread::PostTask(
       client_thread_id_, FROM_HERE,
       NewRunnableMethod(client_.get(), &Client::OnMessageReceived, message));
+  return true;
 }
 
 void UtilityProcessHost::OnProcessCrashed(int exit_code) {
@@ -169,8 +170,9 @@
   return true;
 }
 
-void UtilityProcessHost::Client::OnMessageReceived(
+bool UtilityProcessHost::Client::OnMessageReceived(
     const IPC::Message& message) {
+  bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(UtilityProcessHost, message)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackExtension_Succeeded,
                         Client::OnUnpackExtensionSucceeded)
@@ -192,5 +194,7 @@
                         Client::OnIDBKeysFromValuesAndKeyPathSucceeded)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_IDBKeysFromValuesAndKeyPath_Failed,
                         Client::OnIDBKeysFromValuesAndKeyPathFailed)
+    IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
+  return handled;
 }