Port HistoryService::ScheduleDBTask to CancelableTaskTracker

chrome/browser/ui/sync/profile_signin_confirmation_helper.cc

Index: chrome/browser/ui/sync/profile_signin_confirmation_helper.cc
diff --git a/chrome/browser/ui/sync/profile_signin_confirmation_helper.cc b/chrome/browser/ui/sync/profile_signin_confirmation_helper.cc
index 40cf7132b4f2356f6052f51b7119bc0d45f5ce10..c24e879bdb9ef8c5a089e24fc909079b3aef5774 100644
--- a/chrome/browser/ui/sync/profile_signin_confirmation_helper.cc
+++ b/chrome/browser/ui/sync/profile_signin_confirmation_helper.cc
@@ -92,7 +92,6 @@ class ProfileSigninConfirmationHelper
   Profile* profile_;
 
   // Used for async tasks.
-  CancelableRequestConsumer request_consumer_;
   base::CancelableTaskTracker task_tracker_;
 
   // Keep track of how many async requests are pending.
@@ -162,7 +161,7 @@ void ProfileSigninConfirmationHelper::CheckHasTypedURLs() {
           base::Bind(
               &ProfileSigninConfirmationHelper::ReturnResult,
               this)),
-      &request_consumer_);
+      &task_tracker_);
 }
 
 void ProfileSigninConfirmationHelper::set_pending_requests(int requests) {
@@ -174,7 +173,7 @@ void ProfileSigninConfirmationHelper::ReturnResult(bool result) {
   // result of |true|, otherwise pass the last returned result.
   if (!result_returned_ && (--pending_requests_ == 0 || result)) {
     result_returned_ = true;
-    request_consumer_.CancelAllRequests();
+    task_tracker_.TryCancelAll();
     return_result_.Run(result);
   }
 }