GitLab

Fix a crash caused by posting a callback to the UI thread with a pointer
to a member variable without checking that the originating object is still
alive.

Bug: 1115364
Change-Id: Idf1594e8072d6269d3a0d2e04c17a583400e71c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353396Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
Cr-Commit-Position: refs/heads/master@{#798288}