GitLab

Deletion from the in-memory URL DB can be slow: http://shortn/_eSkRG8RvpV
This CL makes the deletion of queries from the in-memory URL DB async
by posting the deletion task to a sequenced task runner on the UI thread.

Fixed: 1110077
Change-Id: Ia8099093eea6efde952bfbb58cd182b06174f8e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531654Reviewed-by: Ramya Nagarajan <ramyan@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826399}