GitLab

Explicitly skip EndDrag if the end reason is "window is being destroyed".

Bug: 1151072
Test: covered by unittest

Change-Id: I4310f21993d938ee560d13f7a51755a41c375824
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570315
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834463}