Pull ChildProcessSecurityPolicyImpl out to shared subfolder

content/browser/renderer_host/pepper/pepper_external_file_ref_backend.cc

 // 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.
 
 #include "content/browser/renderer_host/pepper/pepper_external_file_ref_backend.h"
 
 #include <string.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util_proxy.h"
-#include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/shared/child_process_security_policy_helper.h"
 #include "content/public/browser/browser_thread.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_time.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/file_type_conversion.h"
 #include "ppapi/shared_impl/time_conversion.h"
 
 namespace content {
 
@@ skipping 131 matching lines @@
         file_info, PP_FILESYSTEMTYPE_EXTERNAL, &pp_file_info);
   } else {
     memset(&pp_file_info, 0, sizeof(pp_file_info));
   }
 
   host_->SendReply(reply_context,
                    PpapiPluginMsg_FileRef_QueryReply(pp_file_info));
 }
 
 }  // namespace content