Prerender: Remove PerceivedPLT 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 508 matching lines @@
   DCHECK(entry);
 
   PrerenderDataVector::iterator it = FindIteratorForPrerenderContents(entry);
   DCHECK(it != active_prerenders_.end());
   to_delete_prerenders_.push_back(std::move(*it));
   active_prerenders_.erase(it);
   // Destroy the old WebContents relatively promptly to reduce resource usage.
   PostCleanupTask();
 }
 
-void PrerenderManager::RecordPageLoadTimeNotSwappedIn(
-    Origin origin,
-    base::TimeDelta page_load_time,
-    const GURL& url) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  histograms_->RecordPageLoadTimeNotSwappedIn(origin, page_load_time, url);
-}
-
-void PrerenderManager::RecordPerceivedPageLoadTime(
-    Origin origin,
-    NavigationType navigation_type,
-    base::TimeDelta perceived_page_load_time,
-    double fraction_plt_elapsed_at_swap_in,
-    const GURL& url) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  if (GetPredictionStatusForOrigin(origin)
-      != NetworkPredictionStatus::ENABLED) {
-    return;
-  }
-
-  histograms_->RecordPerceivedPageLoadTime(
-      origin, perceived_page_load_time, navigation_type, url);
-
-  if (navigation_type == NAVIGATION_TYPE_PRERENDERED) {
-    histograms_->RecordPercentLoadDoneAtSwapin(
-        origin, fraction_plt_elapsed_at_swap_in);
-  }
-}
-
 void PrerenderManager::RecordPrefetchResponseReceived(Origin origin,
                                                       bool is_main_resource,
                                                       bool is_redirect,
                                                       bool is_no_store) {
   histograms_->RecordPrefetchResponseReceived(origin, is_main_resource,
                                               is_redirect, is_no_store);
 }
 
 void PrerenderManager::RecordPrefetchRedirectCount(Origin origin,
                                                    bool is_main_resource,
@@ skipping 367 matching lines @@
       IsGoogleOriginURL(referrer.url)) {
     origin = ORIGIN_GWS_PRERENDER;
   }
 
   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();
-
   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);
   if (prerendering_status != NetworkPredictionStatus::ENABLED) {
@@ skipping 504 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