Reorganize apps/shell into app, browser and common directories

apps/shell/app/shell_main_delegate.h

 // Copyright 2013 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_SHELL_SHELL_MAIN_DELEGATE_H_
-#define APPS_SHELL_SHELL_MAIN_DELEGATE_H_
+#ifndef APPS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
+#define APPS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
 
 namespace apps {
 
 class ShellContentBrowserClient;
 class ShellContentClient;
 
@@ skipping 13 matching lines @@
 
  private:
   scoped_ptr<ShellContentClient> content_client_;
   scoped_ptr<ShellContentBrowserClient> browser_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);
 };
 
 }  // namespace apps
 
-#endif  // APPS_SHELL_SHELL_MAIN_DELEGATE_H_
+#endif  // APPS_SHELL_APP_SHELL_MAIN_DELEGATE_H_