Revert of Change HistoryService::QueryURL to use CancelableTaskTracker

chrome/browser/safe_browsing/browser_feature_extractor.h

Index: chrome/browser/safe_browsing/browser_feature_extractor.h
diff --git a/chrome/browser/safe_browsing/browser_feature_extractor.h b/chrome/browser/safe_browsing/browser_feature_extractor.h
index bae6a16a8a40652646e070716796eaf4bf89667a..bdad2067023fb0cad43c9c7869743bf708bac407 100644
--- a/chrome/browser/safe_browsing/browser_feature_extractor.h
+++ b/chrome/browser/safe_browsing/browser_feature_extractor.h
@@ -21,7 +21,6 @@
 #include "base/containers/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
-#include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
 #include "chrome/browser/common/cancelable_request.h"
 #include "chrome/browser/history/history_types.h"
@@ -145,11 +144,10 @@
 
   // HistoryService callback which is called when we're done querying URL visits
   // in the history.
-  void QueryUrlHistoryDone(scoped_ptr<ClientPhishingRequest> request,
-                           const DoneCallback& callback,
+  void QueryUrlHistoryDone(CancelableRequestProvider::Handle handle,
                            bool success,
-                           const history::URLRow& row,
-                           const history::VisitVector& visits);
+                           const history::URLRow* row,
+                           history::VisitVector* visits);
 
   // HistoryService callback which is called when we're done querying HTTP host
   // visits in the history.
@@ -200,7 +198,6 @@
   content::WebContents* tab_;
   ClientSideDetectionHost* host_;
   CancelableRequestConsumer request_consumer_;
-  base::CancelableTaskTracker cancelable_task_tracker_;
   base::WeakPtrFactory<BrowserFeatureExtractor> weak_factory_;
 
   // Set of pending extractions (i.e. extractions for which ExtractFeatures was