Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

chrome/browser/extensions/api/storage/settings_frontend_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 "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.h"
 #include "chrome/browser/extensions/api/storage/settings_frontend.h"
-#include "chrome/browser/extensions/api/storage/settings_namespace.h"
 #include "chrome/browser/extensions/api/storage/settings_test_util.h"
 #include "chrome/browser/value_store/value_store.h"
 #include "content/public/test/test_browser_thread.h"
+#include "extensions/browser/api/storage/settings_namespace.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 
 namespace extensions {
 
 namespace settings = settings_namespace;
 namespace util = settings_test_util;
 
 namespace {
@@ skipping 245 matching lines @@
   frontend_->RunWithStorage(
       extension, settings::SYNC, base::Bind(&UnlimitedSyncStorageTestCallback));
   frontend_->RunWithStorage(extension,
                             settings::LOCAL,
                             base::Bind(&UnlimitedLocalStorageTestCallback));
 
   base::MessageLoop::current()->RunUntilIdle();
 }
 
 }  // namespace extensions