Move Extension into extensions namespace

chrome/browser/sync/glue/chrome_extensions_activity_monitor_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/sync/glue/chrome_extensions_activity_monitor.h"
 
 #include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/values.h"
 #include "chrome/browser/bookmarks/bookmark_extension_api.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "content/public/browser/notification_service.h"
 #include "content/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using extensions::Extension;
+
 namespace browser_sync {
 
 namespace {
 
 using content::BrowserThread;
 namespace keys = extension_manifest_keys;
 
 // Create and return an extension with the given path.
 scoped_refptr<Extension> MakeExtension(const std::string& name) {
   FilePath path;
@@ skipping 126 matching lines @@
   FireBookmarksApiEvent<CreateBookmarkFunction>(extension1_, 3);
   monitor_.GetAndClearRecords(&results);
 
   EXPECT_EQ(1U, results.size());
   EXPECT_EQ(3U, results[id1_].bookmark_write_count);
 }
 
 }  // namespace
 
 }  // namespace browser_sync