Remove chrome/ code to handle App Notifications

chrome/browser/extensions/api/app/app_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/command_line.h"
-#include "chrome/browser/extensions/extension_apitest.h"
-#include "chrome/common/chrome_switches.h"
-
-class ExperimentalApiTest : public ExtensionApiTest {
- public:
-  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
-    ExtensionApiTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
-  }
-};
-
-IN_PROC_BROWSER_TEST_F(ExperimentalApiTest, AppNotificationIncognito) {
-  ASSERT_TRUE(RunExtensionSubtest(
-      "app_notifications", "test.html",
-      ExtensionApiTest::kFlagEnableIncognito |
-      ExtensionApiTest::kFlagUseIncognito)) << message_;
-}