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Enable the 5 zoom related tests that had been disabled with the update
enabled in both flag states, as the underlying Blink issue has now
been resolved.

Make a few adjustments to the ZoomWithoutBubble test, as recent updates
to the new UI had caused the test to fail with the update flag on.

Bug: 1137905
Change-Id: Iead2dfb1f0dc3eab30553bc8b1e75a353049b5c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538367Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827949}