Prerender: Remove PerceivedPLT histograms

chrome/browser/prerender/prerender_histograms.h

Index: chrome/browser/prerender/prerender_histograms.h
diff --git a/chrome/browser/prerender/prerender_histograms.h b/chrome/browser/prerender/prerender_histograms.h
index e26cd195f9e9938dcacbffa4aace4f2e4cc71991..26945b7a3d2bb3dcd73bff417b46ec938ef724f5 100644
--- a/chrome/browser/prerender/prerender_histograms.h
+++ b/chrome/browser/prerender/prerender_histograms.h
@@ -40,14 +40,6 @@ class PrerenderHistograms {
   // 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,
@@ -59,12 +51,6 @@ class PrerenderHistograms {
   // 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,
@@ -161,12 +147,6 @@ class PrerenderHistograms {
   // 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);