Add the first app_shell_browsertest test.

apps/test/apps_test_launcher_delegate.h

-// Copyright 2014 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.
-
-#ifndef APPS_TEST_APPS_TEST_LAUNCHER_DELEGATE_H_
-#define APPS_TEST_APPS_TEST_LAUNCHER_DELEGATE_H_
-
-#include "content/public/test/test_launcher.h"
-
-namespace apps {
-
-class AppsTestLauncherDelegate : public content::TestLauncherDelegate {
- public:
-  virtual int RunTestSuite(int argc, char** argv) OVERRIDE;
-  virtual bool AdjustChildProcessCommandLine(
-      base::CommandLine* command_line,
-      const base::FilePath& temp_data_dir) OVERRIDE;
-  virtual content::ContentMainDelegate* CreateContentMainDelegate() OVERRIDE;
-};
-
-}  // namespace apps
-
-#endif  // APPS_TEST_APPS_TEST_LAUNCHER_DELEGATE_H_