base::Bind conversion for chrome/browser/extensions/file_reader.

chrome/browser/extensions/file_reader.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/extensions/file_reader.h"
 
+#include "base/bind.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "content/browser/browser_thread.h"
 #include "chrome/common/extensions/extension_resource.h"
 
-FileReader::FileReader(const ExtensionResource& resource, Callback* callback)
+FileReader::FileReader(const ExtensionResource& resource,
+                       const Callback& callback)
     : resource_(resource),
       callback_(callback),
       origin_loop_(MessageLoop::current()) {
-  DCHECK(callback_);
 }
 
 void FileReader::Start() {
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
-      NewRunnableMethod(this, &FileReader::ReadFileOnBackgroundThread));
+      base::Bind(&FileReader::ReadFileOnBackgroundThread, this));
 }
 
 FileReader::~FileReader() {}
 
 void FileReader::ReadFileOnBackgroundThread() {
   std::string data;
   bool success = file_util::ReadFileToString(resource_.GetFilePath(), &data);
-  origin_loop_->PostTask(FROM_HERE, NewRunnableMethod(
-      this, &FileReader::RunCallback, success, data));
+  origin_loop_->PostTask(FROM_HERE, base::Bind(callback_, success, data));
 }
-
-void FileReader::RunCallback(bool success, const std::string& data) {
-  callback_->Run(success, data);
-  delete callback_;
-}