Remove #pragma once from content

content/browser/child_process_security_policy_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_CHILD_PROCESS_SECURITY_POLICY_IMPL_H_
 #define CONTENT_BROWSER_CHILD_PROCESS_SECURITY_POLICY_IMPL_H_
 
-#pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/singleton.h"
 #include "base/synchronization/lock.h"
 #include "content/public/browser/child_process_security_policy.h"
@@ skipping 180 matching lines @@
   SecurityStateMap security_state_;
 
   // This maps keeps the record of which js worker thread child process
   // corresponds to which main js thread child process.
   WorkerToMainProcessMap worker_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessSecurityPolicyImpl);
 };
 
 #endif  // CONTENT_BROWSER_CHILD_PROCESS_SECURITY_POLICY_IMPL_H_