Move scoped_temp_dir from base to base/files

chrome/browser/extensions/app_background_page_apitest.cc

 // 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.
 
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/background/background_contents_service_factory.h"
 #include "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 59 matching lines @@
     // change.
     content::WindowedNotificationObserver watcher(
         chrome::NOTIFICATION_BACKGROUND_MODE_CHANGED,
         content::NotificationService::AllSources());
     watcher.Wait();
     return manager->IsBackgroundModeActiveForTest() == expected_background_mode;
 #endif
   }
 
  private:
-  ScopedTempDir app_dir_;
+  base::ScopedTempDir app_dir_;
 };
 
 // Disable on Mac only.  http://crbug.com/95139
 #if defined(OS_MACOSX)
 #define MAYBE_Basic DISABLED_Basic
 #else
 #define MAYBE_Basic Basic
 #endif
 
 IN_PROC_BROWSER_TEST_F(AppBackgroundPageApiTest, MAYBE_Basic) {
@@ skipping 314 matching lines @@
       BackgroundContentsServiceFactory::GetForProfile(browser()->profile())->
           GetAppBackgroundContents(ASCIIToUTF16(extension->id())));
   // Now close the BackgroundContents.
   ASSERT_TRUE(RunExtensionTest("app_background_page/basic_close")) << message_;
   // Background mode should no longer be active.
   ASSERT_TRUE(WaitForBackgroundMode(false));
   ASSERT_FALSE(
       BackgroundContentsServiceFactory::GetForProfile(browser()->profile())->
           GetAppBackgroundContents(ASCIIToUTF16(extension->id())));
 }