Fix prerender histograms for multiple prerender case.

chrome/browser/chrome_content_browser_client.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/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 1172 matching lines @@
   // If the tab is being prerendered, cancel the prerender and the request.
   WebContents* tab = tab_util::GetWebContentsByID(
       render_process_id, render_view_id);
   if (!tab) {
     NOTREACHED();
     return;
   }
   prerender::PrerenderManager* prerender_manager =
       prerender::PrerenderManagerFactory::GetForProfile(
           Profile::FromBrowserContext(tab->GetBrowserContext()));
-  if (prerender_manager && prerender_manager->IsWebContentsPrerendering(tab)) {
+  if (prerender_manager && prerender_manager->IsWebContentsPrerendering(tab,
+                                                                        NULL)) {
     if (prerender_manager->prerender_tracker()->TryCancel(
             render_process_id, render_view_id,
             prerender::FINAL_STATUS_SSL_ERROR)) {
       *cancel_request = true;
       return;
     }
   }
 
 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
   captive_portal::CaptivePortalTabHelper* captive_portal_tab_helper =
@@ skipping 599 matching lines @@
     partition_id = extension->id();
   }
 
   // Enforce that IsValidStoragePartitionId() implementation stays in sync.
   DCHECK(IsValidStoragePartitionId(browser_context, partition_id));
   return partition_id;
 }
 
 
 }  // namespace chrome