GitLab

Fix
- SyncWebsocketFactory
- MessageCallback
- ConditionalWaitCallback

Change-Id: I9bf3e90df4a4217e158857dc90d4d7356dabcfa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298264Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789200}