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

content/renderer/internal_document_state_data.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_RENDERER_INTERNAL_DOCUMENT_STATE_DATA_H_
 #define CONTENT_RENDERER_INTERNAL_DOCUMENT_STATE_DATA_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
-#include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "url/gurl.h"
 
 namespace blink {
 class WebDataSource;
 }
 
 namespace content {
 
 class DocumentState;
@@ skipping 73 matching lines @@
     return cache_policy_override_;
   }
   void clear_cache_policy_override() {
     cache_policy_override_set_ = false;
     cache_policy_override_ = blink::WebURLRequest::UseProtocolCachePolicy;
   }
   bool is_cache_policy_override_set() const {
     return cache_policy_override_set_;
   }
 
-  // Sets the referrer policy to use. This is only used for browser initiated
-  // navigations, otherwise, the referrer policy is defined by the frame's
-  // document.
-  blink::WebReferrerPolicy referrer_policy() const {
-    return referrer_policy_;
-  }
-  void set_referrer_policy(blink::WebReferrerPolicy referrer_policy) {
-    referrer_policy_ = referrer_policy;
-    referrer_policy_set_ = true;
-  }
-  void clear_referrer_policy() {
-    referrer_policy_ = blink::WebReferrerPolicyDefault;
-    referrer_policy_set_ = false;
-  }
-  bool is_referrer_policy_set() const { return referrer_policy_set_; }
-
  protected:
   virtual ~InternalDocumentStateData();
 
  private:
   bool did_first_visually_non_empty_layout_;
   bool did_first_visually_non_empty_paint_;
   int http_status_code_;
   GURL searchable_form_url_;
   std::string searchable_form_encoding_;
   bool use_error_page_;
   bool is_overriding_user_agent_;
   bool must_reset_scroll_and_scale_state_;
   bool cache_policy_override_set_;
   blink::WebURLRequest::CachePolicy cache_policy_override_;
-  bool referrer_policy_set_;
-  blink::WebReferrerPolicy referrer_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(InternalDocumentStateData);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INTERNAL_DOCUMENT_STATE_DATA_H_