[Offline Pages] Moves Coordinator to using MarkAttemptStarted/MarkAttemptCompleted API.

components/offline_pages/background/request_coordinator.h

Index: components/offline_pages/background/request_coordinator.h
diff --git a/components/offline_pages/background/request_coordinator.h b/components/offline_pages/background/request_coordinator.h
index 1be339301b6765ada546094001045efdb32b9210..1e51f185384f050db808ff1adfae170b44543e3c 100644
--- a/components/offline_pages/background/request_coordinator.h
+++ b/components/offline_pages/background/request_coordinator.h
@@ -123,7 +123,10 @@ class RequestCoordinator : public KeyedService {
                                 const SavePageRequest& request);
 
   // Receives the result of update and delete requests to the request queue.
-  void UpdateRequestCallback(RequestQueue::UpdateRequestResult result);
+  void UpdateRequestCallback(const ClientId& client_id,
+                             RequestQueue::UpdateRequestResult result);
+
+  void UpdateMultipleRequestCallback(RequestQueue::UpdateRequestResult result);
 
   // Callback from the request picker when it has chosen our next request.
   void RequestPicked(const SavePageRequest& request);