Fix crash in AppNotifyChannelSetup when incognito profiles are used.

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:
+  void SetUpCommandLine(CommandLine* command_line) {
+    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_;
+}