Remove stray platform_file.h from chrome and components

chrome/browser/media_galleries/fileapi/media_file_system_backend.cc

 // Copyright (c) 2013 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/media_galleries/fileapi/media_file_system_backend.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
-#include "base/platform_file.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/media_galleries/fileapi/device_media_async_file_util.h"
 #include "chrome/browser/media_galleries/fileapi/media_file_validator_factory.h"
 #include "chrome/browser/media_galleries/fileapi/media_path_filter.h"
@@ skipping 322 matching lines @@
           url.path(),
           offset,
           fileapi::FileStreamWriter::OPEN_EXISTING_FILE));
 }
 
 fileapi::FileSystemQuotaUtil*
 MediaFileSystemBackend::GetQuotaUtil() {
   // No quota support.
   return NULL;
 }