DO NOT MERGE ANYWHERE: [AsyncChannel] Fix race in handling of sync result am: 02d802e71e  -s ours am: b5ee561702  -s ours am: 7391bedf87  -s ours am: 8597268bc2  -s ours am: 8f33b0bd96  -s ours
am: bf1af7c228  -s ours

Change-Id: I863e8001dbad759aec9fe176ade54316675c5f04