Revert of Eagerly remove disposed DOMTimers as observers. (patchset #1 id:1 of https://codereview.chromium.org/1959013002/ )
Reason for revert:
Caused issue 610606, reverting to locally investigate how/why.
Original issue's description:
> Eagerly remove disposed DOMTimers as observers.
>
> Once the coordinator lets go of a timer, no need to keep it
> around as an observer of the ExecutionContext.
>
> R=
> BUG=
>
> Committed: https://crrev.com/0a297738301705d02f57968334bd6f7c7dc95f4c
> Cr-Commit-Position: refs/heads/master@{#392309}
TBR=oilpan-reviews@chromium.org,keishi@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=
Review-Url: https://codereview.chromium.org/1968963002
Cr-Commit-Position: refs/heads/master@{#392901}
2 files changed
