Part 1 of repairing regressions to my old clang check plugins so Nico can

chrome/common/appcache/appcache_dispatcher.h

 // 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.
 
 #ifndef CHROME_COMMON_APPCACHE_APPCACHE_DISPATCHER_H_
 #define CHROME_COMMON_APPCACHE_APPCACHE_DISPATCHER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 #include "chrome/common/appcache/appcache_backend_proxy.h"
 #include "ipc/ipc_channel.h"
 #include "webkit/appcache/appcache_frontend_impl.h"
 
 // Dispatches appcache related messages sent to a child process from the
 // main browser process. There is one instance per child process. Messages
 // are dispatched on the main child thread. The ChildThread base class
 // creates an instance and delegates calls to it.
 class AppCacheDispatcher : public IPC::Channel::Listener {
  public:
   explicit AppCacheDispatcher(IPC::Message::Sender* sender)
       : backend_proxy_(sender) {}
 
   AppCacheBackendProxy* backend_proxy() { return &backend_proxy_; }
 
   // IPC::Channel::Listener implementation
-  bool OnMessageReceived(const IPC::Message& msg);
+  virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Ipc message handlers
   void OnCacheSelected(int host_id, const appcache::AppCacheInfo& info);
   void OnStatusChanged(const std::vector<int>& host_ids,
                        appcache::Status status);
   void OnEventRaised(const std::vector<int>& host_ids,
                      appcache::EventID event_id);
   void OnProgressEventRaised(const std::vector<int>& host_ids,
                              const GURL& url, int num_total, int num_complete);
   void OnErrorEventRaised(const std::vector<int>& host_ids,
                           const std::string& message);
   void OnLogMessage(int host_id, int log_level, const std::string& message);
   void OnContentBlocked(int host_id,
                         const GURL& manifest_url);
 
   AppCacheBackendProxy backend_proxy_;
   appcache::AppCacheFrontendImpl frontend_impl_;
 };
 
 #endif  // CHROME_COMMON_APPCACHE_APPCACHE_DISPATCHER_H_