Change HistoryService::QueryURL to use CancelableTaskTracker

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 85d861ebb3fc60a43cbbc964c10d5ff68c2adb52..aa7551c514049762ea130558a2294c709417fea4 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -1373,11 +1373,11 @@ PrerenderHandle* PrerenderManager::AddPrerender(
     history_service->QueryURL(
         url,
         false,
-        &query_url_consumer_,
         base::Bind(&PrerenderManager::OnHistoryServiceDidQueryURL,
                    base::Unretained(this),
                    origin,
-                   experiment));
+                   experiment),
+        &query_url_tracker_);
   }
 
   StartSchedulingPeriodicCleanups();
@@ -1852,10 +1852,9 @@ void PrerenderManager::RecordCookieSendType(Origin origin,
 void PrerenderManager::OnHistoryServiceDidQueryURL(
     Origin origin,
     uint8 experiment_id,
-    CancelableRequestProvider::Handle handle,
     bool success,
-    const history::URLRow* url_row,
-    history::VisitVector* visists) {
+    const history::URLRow& url_row,
+    const history::VisitVector& visists) {

[blundell, 2014/06/11 11:08:40]

nit: could you rename this to visits while you're here?

[sdefresne, 2014/06/11 16:46:25]

Done.

   histograms_->RecordPrerenderPageVisitedStatus(origin, experiment_id, success);
 }