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

chrome/renderer/plugin_channel_host.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/plugin_channel_host.h"
 
 #include "chrome/common/plugin_messages.h"
 #include "chrome/plugin/npobject_base.h"
 
 #if defined(OS_POSIX)
@@ skipping 96 matching lines @@
 
   if (!npobject)
     proxies_[route_id] = listener;
 }
 
 void PluginChannelHost::RemoveRoute(int route_id) {
   proxies_.erase(route_id);
   PluginChannelBase::RemoveRoute(route_id);
 }
 
-void PluginChannelHost::OnControlMessageReceived(const IPC::Message& message) {
+bool PluginChannelHost::OnControlMessageReceived(const IPC::Message& message) {
+  bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PluginChannelHost, message)
     IPC_MESSAGE_HANDLER(PluginHostMsg_SetException, OnSetException)
     IPC_MESSAGE_HANDLER(PluginHostMsg_PluginShuttingDown, OnPluginShuttingDown)
-    IPC_MESSAGE_UNHANDLED_ERROR()
+    IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+  DCHECK(handled);
+  return handled;
 }
 
 void PluginChannelHost::OnSetException(const std::string& message) {
   WebKit::WebBindings::setException(NULL, message.c_str());
 }
 
 void PluginChannelHost::OnPluginShuttingDown(const IPC::Message& message) {
   expecting_shutdown_ = true;
 }
 
 void PluginChannelHost::OnChannelError() {
   PluginChannelBase::OnChannelError();
 
   for (ProxyMap::iterator iter = proxies_.begin();
        iter != proxies_.end(); iter++) {
     iter->second->OnChannelError();
   }
 
   proxies_.clear();
 }