Use content::Referrer to pass around referrers in the plugin code

content/child/request_info.h

 // Copyright 2014 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_CHILD_REQUEST_INFO_H_
 #define CONTENT_CHILD_REQUEST_INFO_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_types.h"
+#include "content/public/common/referrer.h"
 #include "content/public/common/request_context_frame_type.h"
 #include "content/public/common/request_context_type.h"
 #include "content/public/common/resource_type.h"
 #include "net/base/request_priority.h"
 #include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // Structure used when calling BlinkPlatformImpl::CreateResourceLoader().
 struct CONTENT_EXPORT RequestInfo {
   RequestInfo();
   ~RequestInfo();
 
   // HTTP-style method name (e.g., "GET" or "POST").
   std::string method;
 
   // Absolute URL encoded in ASCII per the rules of RFC-2396.
   GURL url;
 
   // URL of the document in the top-level window, which may be checked by the
   // third-party cookie blocking policy.
   GURL first_party_for_cookies;
 
   // Optional parameter, a URL with similar constraints in how it must be

[Mike West, 2014/11/19 08:54:02]

Nit: Update the comment.

   // encoded as the url member.
-  GURL referrer;
-
-  // The referrer policy that applies to the referrer.
-  blink::WebReferrerPolicy referrer_policy;
+  Referrer referrer;
 
   // For HTTP(S) requests, the headers parameter can be a \r\n-delimited and
   // \r\n-terminated list of MIME headers.  They should be ASCII-encoded using
   // the standard MIME header encoding rules.  The headers parameter can also
   // be null if no extra request headers need to be set.
   std::string headers;
 
   // Composed of the values defined in url_request_load_flags.h.
   int load_flags;
 
@@ skipping 44 matching lines @@
   // Extra data associated with this request.  We do not own this pointer.
   blink::WebURLRequest::ExtraData* extra_data;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RequestInfo);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_REQUEST_INFO_H_