Move Extension into extensions namespace

chrome/browser/themes/browser_theme_pack_unittest.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 "chrome/browser/themes/browser_theme_pack.h"
 
 #include "base/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/json/json_reader.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
 #include "base/values.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/test/test_browser_thread.h"
 #include "grit/theme_resources.h"
 #include "grit/theme_resources_standard.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/color_utils.h"
 
 using content::BrowserThread;
+using extensions::Extension;
 
 class BrowserThemePackTest : public ::testing::Test {
  public:
   BrowserThemePackTest()
       : message_loop(),
         fake_ui_thread(BrowserThread::UI, &message_loop),
         fake_file_thread(BrowserThread::FILE, &message_loop),
         theme_pack_(new BrowserThemePack) {
   }
 
@@ skipping 390 matching lines @@
 
   // Part 2: Try to read back the data pack that we just wrote to disk.
   {
     scoped_refptr<BrowserThemePack> pack =
         BrowserThemePack::BuildFromDataPack(
             file, "mblmlcbknbnfebdfjnolmcapmdofhmme");
     ASSERT_TRUE(pack.get());
     VerifyStarGazing(pack.get());
   }
 }