Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_devtools_events.h

 // Copyright (c) 2011 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_EXTENSION_DEVTOOLS_EVENTS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DEVTOOLS_EVENTS_H_
-#pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 
 // Static utility functions for dealing with extension devtools event names.
 // The format of the event names is <prefix>.<tab id>.<event name>
 // Equivalent name munging is done in the extension process in JavaScript
 // by chrome/renderer/resources/extensions/schema_generated_bindings.js
 class ExtensionDevToolsEvents {
  public:
   // Checks if an event name is a magic devtools event name.  If so,
   // the tab id of the event is put in *tab_id.
   static bool IsDevToolsEventName(const std::string& event_name, int* tab_id);
 
   // Generates the event string for an onPageEvent for a given tab.
   static std::string OnPageEventNameForTab(int tab_id);
 
   // Generates the event string for an onTabCloseEvent for a given tab.
   static std::string OnTabCloseEventNameForTab(int tab_id);
 
  private:
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ExtensionDevToolsEvents);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DEVTOOLS_EVENTS_H_