[sheriff] Mark AcceptValidShareTarget_PayloadSuccessful as flaky

This test causes consistently build failure.

TBR = himanshujaju@chromium.org
TBR = alexchau@chromium.org

Bug: 1123022
Change-Id: I9e8270ac73118ad6f571374125f9c55411a7ab9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2381067
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Reviewed-by: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802679}

chrome/browser/nearby_sharing/nearby_sharing_service_impl_unittest.cc

@@ -2209,7 +2209,9 @@ TEST_F(NearbySharingServiceImplTest, AcceptValidShareTarget) {
   service_->UnregisterReceiveSurface(&callback);
 }
 
-TEST_F(NearbySharingServiceImplTest, AcceptValidShareTarget_PayloadSuccessful) {
+// TODO(crbug.com/1123022): flakily times-out.
+TEST_F(NearbySharingServiceImplTest,
+       DISABLED_AcceptValidShareTarget_PayloadSuccessful) {
   for (int64_t payload_id : kValidIntroductionFramePayloadIds) {
     fake_nearby_connections_manager_->SetPayloadPathStatus(
         payload_id, location::nearby::connections::mojom::Status::kSuccess);