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

webkit/child/weburlrequest_extradata_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 WEBKIT_CHILD_WEBURLREQUEST_EXTRADATA_IMPL_H_
 #define WEBKIT_CHILD_WEBURLREQUEST_EXTRADATA_IMPL_H_
 
 #include "base/compiler_specific.h"
-#include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "webkit/child/webkit_child_export.h"
 
 namespace webkit_glue {
 
 // Base class for Chrome's implementation of the "extra data" stored in each
 // ResourceRequest.
 class WEBKIT_CHILD_EXPORT WebURLRequestExtraDataImpl :
     public NON_EXPORTED_BASE(blink::WebURLRequest::ExtraData) {
  public:
   // |custom_user_agent| is used to communicate an overriding custom user agent
   // to |RenderViewImpl::willSendRequest()|; set to a null string to indicate no
   // override and an empty string to indicate that there should be no user
   // agent. This needs to be here, instead of content's |RequestExtraData| since
   // ppb_url_request_info_impl.cc needs to be able to set it.
   explicit WebURLRequestExtraDataImpl(
-      blink::WebReferrerPolicy referrer_policy,
       const blink::WebString& custom_user_agent,
       bool was_after_preconnect_request);
   virtual ~WebURLRequestExtraDataImpl();
 
-  blink::WebReferrerPolicy referrer_policy() const { return referrer_policy_; }
   const blink::WebString& custom_user_agent() const {
     return custom_user_agent_;
   }
   bool was_after_preconnect_request() { return was_after_preconnect_request_; }
 
  private:
-  blink::WebReferrerPolicy referrer_policy_;
   blink::WebString custom_user_agent_;
   bool was_after_preconnect_request_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLRequestExtraDataImpl);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_CHILD_WEBURLREQUEST_EXTRADATA_IMPL_H_