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This reverts commit 7a9d7b86.

Reason for revert: crbug.com/1118189

Original change's description:
> Reland "Introduce CriteriaHelper#pollUiThreadNested"
> 
> Introduce CriteriaHelper#pollUiThreadNested
> This change adds an assertion that pollUiThread is not called from the
> UI thread, which is equivalent to calling sleep(), and won't actually
> run any UI thread tasks.
> 
> In the few cases where polling the UI Thread from the UI thread is
> necessary, I introduce CriteriaHelper#pollUiThreadNested, which nests
> the looper in order to continue running UI tasks.
> 
> Bug: 1115220
> Change-Id: I9338a607590e8ee0a22bc32477f02867c6e37271
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357289
> Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
> Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798862}

TBR=yfriedman@chromium.org,mthiesse@chromium.org,hypan@google.com

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

Bug: 1115220
Change-Id: I7121ee7847634cee2bd6d9fc1927ce5e34d5d023
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364741Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799808}