Change HistoryService::QueryURL to use CancelableTaskTracker

chrome/browser/history/history_backend.cc

Index: chrome/browser/history/history_backend.cc
diff --git a/chrome/browser/history/history_backend.cc b/chrome/browser/history/history_backend.cc
index 497f1aa5b023cff3adbd50ee2c9036f9b02b9fbb..76b479c9273c5a63d6177f7ed7bcc911ef5b26b4 100644
--- a/chrome/browser/history/history_backend.cc
+++ b/chrome/browser/history/history_backend.cc
@@ -990,26 +990,20 @@ bool HistoryBackend::GetURL(const GURL& url, history::URLRow* url_row) {
   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 {