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This reverts commit e1ccd581.

Reason for revert: Widespread "Check failed: false. Observers can only be added once!" failures.

Original change's description:
> 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/784937
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Greg Thompson <grt@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#521416}

TBR=sky@chromium.org,grt@chromium.org

Change-Id: I33b192c628fdfebe9cfd93b71abd3b394faad9e5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 133341, 751031, 751543, 764415, 789913
Reviewed-on: https://chromium-review.googlesource.com/808204Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521652}