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This Cl fix page freeze when hit-test query send asynchronous
to the client and it disconnect before response.

Bug: 1079304
Change-Id: I0796df15b1e2c1354bd72fb84474e7b077db7d61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2190693Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Auto-Submit: Alexandr Rakov <alrakov@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#780762}