Make FileSystemOperation's lifetime more explicit.

chrome/browser/file_system/browser_file_system_callback_dispatcher.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/browser/file_system/browser_file_system_callback_dispatcher.h"
-
-#include "chrome/browser/file_system/file_system_dispatcher_host.h"
-#include "chrome/common/render_messages.h"
-
-BrowserFileSystemCallbackDispatcher::BrowserFileSystemCallbackDispatcher(
-    FileSystemDispatcherHost* dispatcher_host, int request_id)
-    : dispatcher_host_(dispatcher_host),
-      request_id_(request_id) {
-  DCHECK(dispatcher_host_);
-}
-
-BrowserFileSystemCallbackDispatcher::~BrowserFileSystemCallbackDispatcher() {}
-
-void BrowserFileSystemCallbackDispatcher::DidSucceed() {
-  dispatcher_host_->Send(new ViewMsg_FileSystem_DidSucceed(request_id_));
-  dispatcher_host_->RemoveCompletedOperation(request_id_);
-}
-
-void BrowserFileSystemCallbackDispatcher::DidReadMetadata(
-    const base::PlatformFileInfo& info) {
-  dispatcher_host_->Send(new ViewMsg_FileSystem_DidReadMetadata(
-      request_id_, info));
-  dispatcher_host_->RemoveCompletedOperation(request_id_);
-}
-
-void BrowserFileSystemCallbackDispatcher::DidReadDirectory(
-    const std::vector<base::FileUtilProxy::Entry>& entries, bool has_more) {
-  dispatcher_host_->Send(new ViewMsg_FileSystem_DidReadDirectory(
-      request_id_, entries, has_more));
-  dispatcher_host_->RemoveCompletedOperation(request_id_);
-}
-
-void BrowserFileSystemCallbackDispatcher::DidOpenFileSystem(
-    const std::string& name, const FilePath& path) {
-  dispatcher_host_->Send(
-      new ViewMsg_OpenFileSystemRequest_Complete(
-          request_id_, !path.empty(), name, path));
-  dispatcher_host_->RemoveCompletedOperation(request_id_);
-}
-
-void BrowserFileSystemCallbackDispatcher::DidFail(
-    base::PlatformFileError error_code) {
-  dispatcher_host_->Send(new ViewMsg_FileSystem_DidFail(
-      request_id_, error_code));
-  dispatcher_host_->RemoveCompletedOperation(request_id_);
-}
-
-void BrowserFileSystemCallbackDispatcher::DidWrite(
-    int64 bytes,
-    bool complete) {
-  dispatcher_host_->Send(new ViewMsg_FileSystem_DidWrite(
-      request_id_, bytes, complete));
-  if (complete)
-    dispatcher_host_->RemoveCompletedOperation(request_id_);
-}