Add the first app_shell_browsertest test.

apps/shell/test/shell_test.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_APP_SHELL_TEST_H_
-#define APPS_TEST_APP_SHELL_TEST_H_
+#ifndef APPS_SHELL_TEST_SHELL_TEST_H_
+#define APPS_SHELL_TEST_SHELL_TEST_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/test/browser_test.h"
 #include "content/public/test/browser_test_base.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 class ShellExtensionSystem;
 }
 
 namespace apps {
 
 // Base class for app shell browser tests.
 class AppShellTest : public content::BrowserTestBase {
  public:
   AppShellTest();
   virtual ~AppShellTest();
 
+  // content::BrowserTestBase implementation.
+  virtual void SetUp() OVERRIDE;
   virtual void SetUpOnMainThread() OVERRIDE;
   virtual void RunTestOnMainThreadLoop() OVERRIDE;
 
   // Loads an unpacked application from a directory using |extension_system_|
   // and attempts to launch it. Returns true on success.
   bool LoadAndLaunchApp(const base::FilePath& app_dir);
 
   content::BrowserContext* browser_context() { return browser_context_; }
 
  private:
   content::BrowserContext* browser_context_;
   extensions::ShellExtensionSystem* extension_system_;
 };
 
 }  // namespace apps
 
-#endif  // APPS_TEST_APP_SHELL_TEST_H_
+#endif  // APPS_SHELL_TEST_SHELL_TEST_H_