Change HistoryService::QueryURL to use CancelableTaskTracker

chrome/browser/history/history_backend.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/history/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 972 matching lines @@
   db_->GetVisitsSource(visits, sources);
   return true;
 }
 
 bool HistoryBackend::GetURL(const GURL& url, history::URLRow* url_row) {
   if (db_)
     return db_->GetRowForURL(url, url_row) != 0;
   return false;
 }
 
-void HistoryBackend::QueryURL(scoped_refptr<QueryURLRequest> request,
-                              const GURL& url,
-                              bool want_visits) {
-  if (request->canceled())
-    return;
-
-  bool success = false;
-  URLRow* row = &request->value.a;
-  VisitVector* visits = &request->value.b;
-  if (db_) {
-    if (db_->GetRowForURL(url, row)) {
-      // Have a row.
-      success = true;
-
-      // Optionally query the visits.
-      if (want_visits)
-        db_->GetVisitsForURL(row->id(), visits);
+void HistoryBackend::QueryURL(const GURL& url,
+                              bool want_visits,
+                              bool* success,
+                              URLRow* url_row,
+                              VisitVector* visits) {
+  DCHECK(success);
+  DCHECK(url_row);
+  DCHECK(!want_visits || visits);
+  if ((*success = db_ && db_->GetRowForURL(url, url_row))) {
+    // Optionally query the visits.
+    if (want_visits) {
+      db_->GetVisitsForURL(url_row->id(), visits);
     }
   }
-  request->ForwardResult(request->handle(), success, row, visits);
 }
 
 TypedUrlSyncableService* HistoryBackend::GetTypedUrlSyncableService() const {
   return typed_url_syncable_service_.get();
 }
 
 // Segment usage ---------------------------------------------------------------
 
 void HistoryBackend::DeleteOldSegmentData() {
   if (db_)
@@ skipping 1825 matching lines @@
   int rank = kPageVisitStatsMaxTopSites;
   std::map<GURL, int>::const_iterator it = most_visited_urls_map_.find(url);
   if (it != most_visited_urls_map_.end())
     rank = (*it).second;
   UMA_HISTOGRAM_ENUMERATION("History.TopSitesVisitsByRank",
                             rank, kPageVisitStatsMaxTopSites + 1);
 }
 #endif
 
 }  // namespace history