Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/state_store.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_STATE_STORE_H_
 #define CHROME_BROWSER_EXTENSIONS_STATE_STORE_H_
-#pragma once
 
 #include <set>
 #include <string>
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/value_store/value_store_frontend.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
@@ skipping 39 matching lines @@
   // List of all known keys. They will be cleared for each extension when it is
   // (un)installed.
   std::set<std::string> registered_keys_;
 
   content::NotificationRegistrar registrar_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_STATE_STORE_H_