Reland of actor History's CommitLaterTask with CancelableCallback

components/history/core/browser/typed_url_syncable_service_unittest.cc

Index: components/history/core/browser/typed_url_syncable_service_unittest.cc
diff --git a/components/history/core/browser/typed_url_syncable_service_unittest.cc b/components/history/core/browser/typed_url_syncable_service_unittest.cc
index 3ed3d8e166ad554a98f11c290ee5b859f260498c..749938ca5a7331117834be02aba32a50acb5a4ec 100644
--- a/components/history/core/browser/typed_url_syncable_service_unittest.cc
+++ b/components/history/core/browser/typed_url_syncable_service_unittest.cc
@@ -224,6 +224,10 @@
     typed_url_sync_service_ =
         fake_history_backend_->GetTypedUrlSyncableService();
     fake_change_processor_.reset(new syncer::FakeSyncChangeProcessor);
+  }
+
+  void TearDown() override {
+    fake_history_backend_->Closing();
   }
 
   // Starts sync for |typed_url_sync_service_| with |initial_data| as the