Don't try to guess the referrer policy, but use the one associated with the request

content/renderer/pepper/url_request_info_util.cc

 // 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.
 
 #include "content/renderer/pepper/url_request_info_util.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "content/common/fileapi/file_system_messages.h"
 #include "content/renderer/pepper/common.h"
@@ skipping 159 matching lines @@
   if (data->has_custom_content_transfer_encoding &&
       !data->custom_content_transfer_encoding.empty()) {
     dest->addHTTPHeaderField(
         WebString::fromUTF8("Content-Transfer-Encoding"),
         WebString::fromUTF8(data->custom_content_transfer_encoding));
   }
 
   if (data->has_custom_user_agent) {
     bool was_after_preconnect_request = false;
     dest->setExtraData(new webkit_glue::WebURLRequestExtraDataImpl(
-        frame->document().referrerPolicy(),
         WebString::fromUTF8(data->custom_user_agent),
         was_after_preconnect_request));
   }
 
   return true;
 }
 
 bool URLRequestRequiresUniversalAccess(const URLRequestInfoData& data) {
   return
       data.has_custom_referrer_url ||
       data.has_custom_content_transfer_encoding ||
       data.has_custom_user_agent ||
       url_util::FindAndCompareScheme(data.url, "javascript", NULL);
 }
 
 }  // namespace content