Move Extension into extensions namespace

chrome/browser/extensions/api/context_menu/context_menu_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 "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_browser_event_router.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/extensions/extension_action.h"
 #include "chrome/test/base/ui_test_utils.h"
 
 namespace extensions {
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContextMenus) {
   ASSERT_TRUE(RunExtensionTest("context_menus/basics")) << message_;
   ASSERT_TRUE(RunExtensionTest("context_menus/no_perms")) << message_;
 }
 
 // crbug.com/51436 -- creating context menus from multiple script contexts
 // should work.
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContextMenusFromMultipleContexts) {
   ASSERT_TRUE(test_server()->Start());
   ASSERT_TRUE(RunExtensionTest("context_menus/add_from_multiple_contexts"))
       << message_;
-  const Extension* extension = GetSingleLoadedExtension();
+  const extensions::Extension* extension = GetSingleLoadedExtension();
   ASSERT_TRUE(extension) << message_;
 
   {
     // Tell the extension to update the page action state.
     ResultCatcher catcher;
     ui_test_utils::NavigateToURL(browser(),
         extension->GetResourceURL("popup.html"));
     ASSERT_TRUE(catcher.GetNextResult());
   }
 
   {
     // Tell the extension to update the page action state again.
     ResultCatcher catcher;
     ui_test_utils::NavigateToURL(browser(),
         extension->GetResourceURL("popup2.html"));
     ASSERT_TRUE(catcher.GetNextResult());
   }
 }
 
 }  // namespace extensions