Port HistoryService::GetVisibleVisitCountToHost to CancelableTaskTracker

chrome/browser/safe_browsing/safe_browsing_blocking_page.h

Index: chrome/browser/safe_browsing/safe_browsing_blocking_page.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_blocking_page.h b/chrome/browser/safe_browsing/safe_browsing_blocking_page.h
index 6b9f232eca39b6ba8b44458df9026b42f04e03cf..b5ac288a785ff312ccd2202e80151ac0f8b63f72 100644
--- a/chrome/browser/safe_browsing/safe_browsing_blocking_page.h
+++ b/chrome/browser/safe_browsing/safe_browsing_blocking_page.h
@@ -33,6 +33,7 @@
 #include <vector>
 
 #include "base/gtest_prod_util.h"
+#include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/safe_browsing/ui_manager.h"
@@ -124,10 +125,7 @@ class SafeBrowsingBlockingPage : public content::InterstitialPageDelegate {
   void RecordUserAction(BlockingPageEvent event);
 
   // Used to query the HistoryService to see if the URL is in history. For UMA.
-  void OnGotHistoryCount(HistoryService::Handle handle,
-                         bool success,
-                         int num_visits,
-                         base::Time first_visit);
+  void OnGotHistoryCount(bool success, int num_visits, base::Time first_visit);
 
   // Records the time it took for the user to react to the
   // interstitial.  We won't double-count if this method is called
@@ -221,7 +219,7 @@ class SafeBrowsingBlockingPage : public content::InterstitialPageDelegate {
 
   // How many times is this same URL in history? Used for histogramming.
   int num_visits_;
-  CancelableRequestConsumer request_consumer_;
+  base::CancelableTaskTracker request_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingBlockingPage);
 };