Remove #pragma once from content

content/browser/debugger/devtools_manager_impl.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 CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_IMPL_H_
-#pragma once
 
 #include <map>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/singleton.h"
 #include "content/browser/debugger/devtools_agent_host.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/devtools_client_host.h"
 #include "content/public/browser/devtools_manager.h"
@@ skipping 105 matching lines @@
       OrphanClientHosts;
   OrphanClientHosts orphan_client_hosts_;
   int last_orphan_cookie_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsManagerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_IMPL_H_