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

content/child/npapi/plugin_url_fetcher.h

Index: content/child/npapi/plugin_url_fetcher.h
diff --git a/content/child/npapi/plugin_url_fetcher.h b/content/child/npapi/plugin_url_fetcher.h
index 57eb5a5beba4f9bb18dade46c6f1e558ca511b9e..ace77ff026562b8f8becfe735756abcc0de454d6 100644
--- a/content/child/npapi/plugin_url_fetcher.h
+++ b/content/child/npapi/plugin_url_fetcher.h
@@ -9,6 +9,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/child/request_peer.h"
+#include "content/public/common/referrer.h"
 #include "url/gurl.h"
 
 namespace content {
@@ -25,7 +26,7 @@ class PluginURLFetcher : public RequestPeer {
                    const std::string& method,
                    const char* buf,
                    unsigned int len,
-                   const GURL& referrer,
+                   const Referrer& referrer,
                    const std::string& range,
                    bool notify_redirects,
                    bool is_plugin_src_load,
@@ -43,7 +44,7 @@ class PluginURLFetcher : public RequestPeer {
   void URLRedirectResponse(bool allow);
 
   GURL first_party_for_cookies() { return first_party_for_cookies_; }
-  GURL referrer() { return referrer_; }
+  Referrer referrer() { return referrer_; }
   int origin_pid() { return origin_pid_; }
   int render_frame_id() { return render_frame_id_; }
   int render_view_id() { return render_view_id_; }
@@ -72,7 +73,7 @@ class PluginURLFetcher : public RequestPeer {
   PluginStreamUrl* plugin_stream_;
   GURL url_;
   GURL first_party_for_cookies_;
-  GURL referrer_;
+  Referrer referrer_;
   bool notify_redirects_;
   bool is_plugin_src_load_;
   int origin_pid_;