Add the first app_shell_browsertest test.

apps/test/apps_test_launcher_delegate.cc

-// 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.
-
-#include "apps/test/apps_test_launcher_delegate.h"
-
-#include "apps/shell/app/shell_main_delegate.h"
-#include "base/test/test_suite.h"
-
-namespace apps {
-
-int AppsTestLauncherDelegate::RunTestSuite(int argc, char** argv) {
-  return base::TestSuite(argc, argv).Run();
-}
-
-bool AppsTestLauncherDelegate::AdjustChildProcessCommandLine(
-    base::CommandLine* command_line,
-    const base::FilePath& temp_data_dir) {
-  return true;
-}
-
-content::ContentMainDelegate*
-AppsTestLauncherDelegate::CreateContentMainDelegate() {
-  return new ShellMainDelegate();
-}
-
-}  // namespace apps