GitLab

The CFRunLoopTimer invalidation hack has been removed from MessagePump,
so the workarounds for bugs caused by it can be removed.

Bug: 925998, 920795, 1031343
Change-Id: I0c560a5569d798b3b41f5c287b2dc36fd0fcb715
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251746Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779929}