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This reverts commit 62973d1b.

Reason for revert: results in more churn in
base::Time::ActivateHighResolutionTimer()
without much benefits (decreased 97th and 98th percentile of
Windows.HighResolutionTimerUsage from 100% to 97% and 99%
respectively). See crbug.com/863938

Original change's description:
> [MessageLoop] Disable hi-res timers when not sleeping
> 
> Time::ActivateHighResolutionTimer(bool activating) is a per-thread vote
> for a system-wide side-effect. For a given thread, hi-res timers are
> only useful when going to sleep (if it has pending hi-res tasks).
> 
> Deactivating a thread's vote while it's active will prevent other
> threads on the system which do not have hi-res requirements from
> being forced to use hi-res timers in that period.
> 
> Bug: 854237
> Change-Id: I1393e184cac6c9321d13b92b6077a38c62b1f590
> Reviewed-on: https://chromium-review.googlesource.com/1107110
> Reviewed-by: danakj <danakj@chromium.org>
> Reviewed-by: kylechar <kylechar@chromium.org>
> Commit-Queue: Gabriel Charette <gab@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#574259}

TBR=danakj@chromium.org,gab@chromium.org,kylechar@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 854237, 863938
Change-Id: I7c26646cac8548ae7b02c90e045bc857ae890ce7
Reviewed-on: https://chromium-review.googlesource.com/1140753Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576157}