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Enable interactive_ui_tests on Windows that now run mostly reliably.

r516772 was the last of many commits that resolved a number of problems
that made this test suite flaky on Windows. This CL enables tests that
had been disabled over time due to flakes, yet now seem to run okay.

BUG=133341,751031,751543,764415,789913
This CL was uploaded by git cl split.

R=sky@chromium.org

Change-Id: I753c741a9194f489f072cd86d72407a1294150c3
Reviewed-on: https://chromium-review.googlesource.com/784937Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521416}