Revert 98131 - Add code to keep track of what fraction of pageviews are top sites.

chrome/browser/prerender/prerender_observer.cc

Index: chrome/browser/prerender/prerender_observer.cc
===================================================================
--- chrome/browser/prerender/prerender_observer.cc	(revision 98134)
+++ chrome/browser/prerender/prerender_observer.cc	(working copy)
@@ -80,19 +80,6 @@
   base::Histogram* time_hover_until_click_;
 };
 
-enum PAGEVIEW_EVENTS {
-  PAGEVIEW_EVENT_NEW_URL = 0,
-  PAGEVIEW_EVENT_TOP_SITE_NEW_URL = 1,
-  PAGEVIEW_EVENT_LOAD_START = 2,
-  PAGEVIEW_EVENT_TOP_SITE_LOAD_START = 3,
-  PAGEVIEW_EVENT_MAX = 4
-};
-
-void RecordPageviewEvent(PAGEVIEW_EVENTS event) {
-  UMA_HISTOGRAM_ENUMERATION("Prerender.PageviewEvents",
-                            event, PAGEVIEW_EVENT_MAX);
-}
-
 }  // namespace
 
 class PrerenderObserver::HoverData {
@@ -193,9 +180,6 @@
 
 void PrerenderObserver::ProvisionalChangeToMainFrameUrl(const GURL& url,
                                                         bool has_opener_set) {
-  RecordPageviewEvent(PAGEVIEW_EVENT_NEW_URL);
-  if (IsTopSite(url))
-    RecordPageviewEvent(PAGEVIEW_EVENT_TOP_SITE_NEW_URL);
   if (!tab_->delegate())
     return;  // PrerenderManager needs a delegate to handle the swap.
   PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
@@ -221,10 +205,6 @@
                                                           bool has_opener_set,
                                                           const GURL& url) {
   if (is_main_frame) {
-    RecordPageviewEvent(PAGEVIEW_EVENT_LOAD_START);
-    if (IsTopSite(url))
-      RecordPageviewEvent(PAGEVIEW_EVENT_TOP_SITE_LOAD_START);
-
     // Record the beginning of a new PPLT navigation.
     pplt_load_start_ = base::TimeTicks::Now();
 
@@ -323,9 +303,4 @@
   current_hover_url_ = GURL();
 }
 
-bool PrerenderObserver::IsTopSite(const GURL& url) {
-  PrerenderManager* pm = MaybeGetPrerenderManager();
-  return (pm && pm->IsTopSite(url));
-}
-
 }  // namespace prerender