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

chrome/common/file_system/file_system_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_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_H_
 #define CHROME_COMMON_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_util_proxy.h"
 #include "base/id_map.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_message.h"
 #include "webkit/fileapi/file_system_callback_dispatcher.h"
 #include "webkit/fileapi/file_system_types.h"
 
 namespace base {
 struct PlatformFileInfo;
 }
 
 class FilePath;
 class GURL;
 
 // Dispatches and sends file system related messages sent to/from a child
 // process from/to the main browser process.  There is one instance
 // per child process.  Messages are dispatched on the main child thread.
-class FileSystemDispatcher {
+class FileSystemDispatcher : public IPC::Channel::Listener {
  public:
   FileSystemDispatcher();
   ~FileSystemDispatcher();
 
+  // IPC::Channel::Listener implementation.
   bool OnMessageReceived(const IPC::Message& msg);
 
   bool OpenFileSystem(const GURL& origin_url,
                       fileapi::FileSystemType type,
                       long long size,
                       bool create,
                       fileapi::FileSystemCallbackDispatcher* dispatcher);
   bool Move(const FilePath& src_path,
             const FilePath& dest_path,
             fileapi::FileSystemCallbackDispatcher* dispatcher);
@@ skipping 49 matching lines @@
       bool has_more);
   void DidFail(int request_id, base::PlatformFileError error_code);
   void DidWrite(int request_id, int64 bytes, bool complete);
 
   IDMap<fileapi::FileSystemCallbackDispatcher, IDMapOwnPointer> dispatchers_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemDispatcher);
 };
 
 #endif  // CHROME_COMMON_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_H_