Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

chrome/browser/extensions/api/storage/settings_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/bind.h"
 #include "base/json/json_writer.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/values.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_sync_util.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/ui_test_utils.h"
+#include "extensions/browser/api/storage/settings_namespace.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/value_builder.h"
 #include "sync/api/fake_sync_change_processor.h"
 #include "sync/api/sync_change.h"
 #include "sync/api/sync_change_processor.h"
 #include "sync/api/sync_change_processor_wrapper_for_test.h"
 #include "sync/api/sync_error_factory.h"
 #include "sync/api/sync_error_factory_mock.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ skipping 542 matching lines @@
   // ENABLE_CONFIGURATION_POLICY is not defined.
   SettingsFrontend* frontend = SettingsFrontend::Get(browser()->profile());
   frontend->DisableStorageForTesting(MANAGED);
   EXPECT_FALSE(frontend->IsStorageEnabled(MANAGED));
   // Now run the extension.
   ASSERT_TRUE(RunExtensionTest("settings/managed_storage_disabled"))
       << message_;
 }
 
 }  // namespace extensions