Port HistoryService::QueryRedirects{From,To} to CancelableTaskTracker

chrome/browser/history/history_service.h

Index: chrome/browser/history/history_service.h
diff --git a/chrome/browser/history/history_service.h b/chrome/browser/history/history_service.h
index 75289c2787d1fa6bceb0c0106ab23377c70718df..8f90152d1bcf3f2119b5ce547c3cd2d063cbbb24 100644
--- a/chrome/browser/history/history_service.h
+++ b/chrome/browser/history/history_service.h
@@ -273,23 +273,25 @@ class HistoryService : public CancelableRequestProvider,
   // redirect, the vector will be empty. If the history system failed for
   // some reason, success will additionally be false. If the given page
   // has redirected to multiple destinations, this will pick a random one.
-  typedef base::Callback<void(Handle,
-                              GURL,  // from_url / to_url
+  typedef base::Callback<void(GURL,  // from_url / to_url
                               bool,  // success
-                              history::RedirectList*)> QueryRedirectsCallback;
+                              const history::RedirectList*)>
+      QueryRedirectsCallback;
 
   // Schedules a query for the most recent redirect coming out of the given
   // URL. See the RedirectQuerySource above, which is guaranteed to be called
   // if the request is not canceled.
-  Handle QueryRedirectsFrom(const GURL& from_url,
-                            CancelableRequestConsumerBase* consumer,
-                            const QueryRedirectsCallback& callback);
+  base::CancelableTaskTracker::TaskId QueryRedirectsFrom(
+      const GURL& from_url,
+      const QueryRedirectsCallback& callback,
+      base::CancelableTaskTracker* tracker);
 
   // Schedules a query to get the most recent redirects ending at the given
   // URL.
-  Handle QueryRedirectsTo(const GURL& to_url,
-                          CancelableRequestConsumerBase* consumer,
-                          const QueryRedirectsCallback& callback);
+  base::CancelableTaskTracker::TaskId QueryRedirectsTo(
+      const GURL& to_url,
+      const QueryRedirectsCallback& callback,
+      base::CancelableTaskTracker* tracker);
 
   typedef base::Callback<
       void(Handle,