[NoStatePrefetch] Add performance histograms.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.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/renderer_host/chrome_resource_dispatcher_host_delegate.h"
 
 #include <stdint.h>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 136 matching lines @@
 prerender::PrerenderManager* GetPrerenderManager(
     content::WebContents* web_contents) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   if (!web_contents)
     return NULL;
 
   content::BrowserContext* browser_context = web_contents->GetBrowserContext();
   if (!browser_context)
     return NULL;
 
-  Profile* profile = Profile::FromBrowserContext(browser_context);
-  if (!profile)
-    return NULL;
-
-  return prerender::PrerenderManagerFactory::GetForProfile(profile);
+  return prerender::PrerenderManagerFactory::GetForBrowserContext(
+      browser_context);
 }
 
 void UpdatePrerenderNetworkBytesCallback(content::WebContents* web_contents,
                                          int64_t bytes) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   // PrerenderContents::FromWebContents handles the NULL case.
   prerender::PrerenderContents* prerender_contents =
       prerender::PrerenderContents::FromWebContents(web_contents);
 
   if (prerender_contents)
@@ skipping 692 matching lines @@
           base::Bind(&ChromeResourceDispatcherHostDelegate::OnAbortedFrameLoad,
                     base::Unretained(this), url, request_loading_time));
       return;
   }
 
   std::string metric_name = (request_loading_time.InMilliseconds() < 100 ?
       "Net.ErrAborted.Fast" : "Net.ErrAborted.Slow");
   rappor::SampleDomainAndRegistryFromGURL(
       g_browser_process->rappor_service(), metric_name, url);
 }