Remove stray platform_file.h from chrome and components

chrome/browser/ui/webui/help/help_handler.h

 // Copyright (c) 2012 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_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/help/version_updater.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 #if defined(OS_CHROMEOS)
-#include "base/platform_file.h"
 #include "chrome/browser/chromeos/version_loader.h"
 #endif  // defined(OS_CHROMEOS)
 
 namespace content {
 class WebUIDataSource;
 }
 
 // WebUI message handler for the help page.
 class HelpHandler : public content::WebUIMessageHandler,
                     public content::NotificationObserver {
@@ skipping 68 matching lines @@
   base::CancelableTaskTracker tracker_;
 #endif  // defined(OS_CHROMEOS)
 
   // Used for callbacks.
   base::WeakPtrFactory<HelpHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HelpHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_