Revert of Port HistoryService::GetVisibleVisitCountToHost to CancelableTaskTracker

chrome/browser/ssl/ssl_blocking_page.h

Index: chrome/browser/ssl/ssl_blocking_page.h
diff --git a/chrome/browser/ssl/ssl_blocking_page.h b/chrome/browser/ssl/ssl_blocking_page.h
index f9782cd65c3433ab2474f7a11b8e0e15928666d7..605115854af52bd05e0c62adbebd1dbd44160c1d 100644
--- a/chrome/browser/ssl/ssl_blocking_page.h
+++ b/chrome/browser/ssl/ssl_blocking_page.h
@@ -10,7 +10,6 @@
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
-#include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
 #include "chrome/browser/history/history_service.h"
 #include "content/public/browser/interstitial_page_delegate.h"
@@ -85,7 +84,10 @@
   std::string GetHTMLContentsV2();
 
   // Used to query the HistoryService to see if the URL is in history. For UMA.
-  void OnGotHistoryCount(bool success, int num_visits, base::Time first_visit);
+  void OnGotHistoryCount(HistoryService::Handle handle,
+                         bool success,
+                         int num_visits,
+                         base::Time first_visit);
 
   // content::NotificationObserver:
   virtual void Observe(
@@ -109,7 +111,7 @@
   // How many times is this same URL in history?
   int num_visits_;
   // Used for getting num_visits_.
-  base::CancelableTaskTracker request_tracker_;
+  CancelableRequestConsumer request_consumer_;
   // Is captive portal detection enabled?
   bool captive_portal_detection_enabled_;
   // Did the probe complete before the interstitial was closed?