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Also fixing some tests that fail due to the addition of the assert.
cr.js is included by default in the extraLibraries of the PolymerTest
base class, so test classes that do not override extraLibraries and
import cr.m.js cause the webUIResponse/webUIListenerCallback to be
set twice.

Bug: 1004967
Change-Id: I7c31cc4df5119556f62e1afe7ebf1b85cb0c6722
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885230Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710122}