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A few places in the scheduling code take a queue as an argument to
recording metrics but don't actually use the queue for anything. This
CL removes those references.

This CL is also a pre-requiste for crrev.com/c/2453591 which refactors
MainThreadTaskQueue to not extend TaskQueue. Removing these unecessary
references makes that refactor simpler.

Change-Id: Ie98e19e44be2e5d156981a775c757f97766d0c35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486214
Commit-Queue: Katie Dillon <kdillon@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819858}