[Prerender] Remove the "wash" origin in prerender histograms

chrome/browser/prerender/prerender_manager.cc

 // 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.
 
 #include "chrome/browser/prerender/prerender_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
@@ skipping 926 matching lines @@
   }
 
   if (IsPrerenderSilenceExperiment(origin))
     return nullptr;
 
   GURL url = url_arg;
   GURL alias_url;
 
   // From here on, we will record a FinalStatus so we need to register with the
   // histogram tracking.
-  histograms_->RecordPrerender(origin, url_arg);
+  histograms_->RecordPrerender();
 
   if (profile_->GetPrefs()->GetBoolean(prefs::kBlockThirdPartyCookies) &&
       origin != ORIGIN_OFFLINE) {
     RecordFinalStatusWithoutCreatingPrerenderContents(
         url, origin, FINAL_STATUS_BLOCK_THIRD_PARTY_COOKIES);
     return nullptr;
   }
 
   NetworkPredictionStatus prerendering_status =
       GetPredictionStatusForOrigin(origin);
@@ skipping 505 matching lines @@
   return weak_factory_.GetWeakPtr();
 }
 
 void PrerenderManager::SetPrerenderContentsFactoryForTest(
     PrerenderContents::Factory* prerender_contents_factory) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   prerender_contents_factory_.reset(prerender_contents_factory);
 }
 
 }  // namespace prerender