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The previous behaviour of MessagePumpForUI::Abort was to prevent
delayed tasks from running, but non-delayed tasks would continue to run.
This was almost certainly not intentional, and an aborted pump probably
shouldn't be running any tasks at all.

Bug: 780100
Change-Id: I56ad5b0b5d0621450fc62a35c4d927f4975ae6a4
Reviewed-on: https://chromium-review.googlesource.com/748979Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513303}