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

content/child/npapi/webplugin_delegate_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 CONTENT_CHILD_NPAPI_WEBPLUGIN_DELEGATE_IMPL_H_
 #define CONTENT_CHILD_NPAPI_WEBPLUGIN_DELEGATE_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 103 matching lines @@
   WebPluginResourceClient* CreateSeekableResourceClient(
       unsigned long resource_id,
       int range_request_id) override;
   void FetchURL(unsigned long resource_id,
                 int notify_id,
                 const GURL& url,
                 const GURL& first_party_for_cookies,
                 const std::string& method,
                 const char* buf,
                 unsigned int len,
-                const GURL& referrer,
+                const Referrer& referrer,
                 bool notify_redirects,
                 bool is_plugin_src_load,
                 int origin_pid,
                 int render_frame_id,
                 int render_view_id) override;
   // End of WebPluginDelegate implementation.
 
   gfx::PluginWindowHandle windowed_handle() const { return windowed_handle_; }
   bool IsWindowless() const { return windowless_; }
   PluginInstance* instance() { return instance_.get(); }
@@ skipping 334 matching lines @@
 
   // True if NPP_New did not return an error.
   bool creation_succeeded_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_NPAPI_WEBPLUGIN_DELEGATE_IMPL_H_