Prerender: Remove PerceivedPLT histograms

chrome/browser/prerender/prerender_histograms.h

 // 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.
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_HISTOGRAMS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_HISTOGRAMS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 22 matching lines @@
 // currently underway (based on the PrerenderOrigin of the most recent
 // prerenders, and any experiments detected).
 // PrerenderHistograms does not necessarily record all histograms related to
 // prerendering, only the ones in the context of PrerenderManager.
 class PrerenderHistograms {
  public:
   // Owned by a PrerenderManager object for the lifetime of the
   // PrerenderManager.
   PrerenderHistograms();
 
-  // Records the perceived page load time for a page - effectively the time from
-  // when the user navigates to a page to when it finishes loading.  The actual
-  // load may have started prior to navigation due to prerender hints.
-  void RecordPerceivedPageLoadTime(Origin origin,
-                                   base::TimeDelta perceived_page_load_time,
-                                   NavigationType navigation_type,
-                                   const GURL& url);
-
   // Record that a first contentful paint occured, and whether we were able to
   // successfuly record the perceived FCP.
   void RecordPerceivedFirstContentfulPaintStatus(Origin origin,
                                                  bool successful,
                                                  bool was_hidden);
 
   // Records, in a histogram, the percentage of the page load time that had
   // elapsed by the time it is swapped in.  Values outside of [0, 1.0] are
   // invalid and ignored.
   void RecordPercentLoadDoneAtSwapin(Origin origin, double fraction) const;
 
-  // Records the actual pageload time of a prerender that has not been swapped
-  // in yet, but finished loading.
-  void RecordPageLoadTimeNotSwappedIn(Origin origin,
-                                      base::TimeDelta page_load_time,
-                                      const GURL& url) const;
-
   // Records the time from when a page starts prerendering to when the user
   // navigates to it. This must be called on the UI thread.
   void RecordTimeUntilUsed(Origin origin,
                            base::TimeDelta time_until_used) const;
 
   // Records the time from when a prerender is abandoned to when the user
   // navigates to it. This must be called on the UI thread.
   void RecordAbandonTimeUntilUsed(Origin origin,
                                   base::TimeDelta time_until_used) const;
 
@@ skipping 76 matching lines @@
 
   // A boolean indicating that we have recently encountered a combination of
   // different origins, making an attribution of PPLT's to origins impossible.
   bool origin_wash_;
 
   // The time when we last saw a prerender request coming from a renderer.
   // This is used to record perceived PLT's for a certain amount of time
   // from the point that we last saw a <link rel=prerender> tag.
   base::TimeTicks last_prerender_seen_time_;
 
-  // Indicates whether we have recorded page load events after the most
-  // recent prerender.  These must be initialized to true, so that we don't
-  // start recording events before the first prerender occurs.
-  bool seen_any_pageload_;
-  bool seen_pageload_started_after_prerender_;
-
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderHistograms);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_HISTOGRAMS_H_