GitLab

This avoids potential race when conversation involves opening
a new window which immediately closes the conversation.

Bug: b/173833583
Change-Id: I56654232099c5bb7318fcd17ed26e0d3bbb0d66d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623116
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Jeroen Dhollander <jeroendh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842812}