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- If there is a small overlay in the page (e.g. sticky ad on the side),
and the user shrinks the viewport to make the overlay centered &
relatively large, we don't want to consider it to be a "popup".
- Changed all relevant tests to promise_test for better readability.
- Removed most waitings in web_tests by disabling the frequency capping.
- A bugfix: It was a no-op to compare last_detection_main_frame_size_
and main_frame_size after setting them equal. This patch moves the
setting after the comparison.
- An improvement/fix: for the current overlay candidate, always check
element->IsAdRelated() in each detection, and update its ad status if it
becomes an ad.

Bug: 1032681
Change-Id: If1d945be69d51289cf3314b5700e265772f0087e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2291211Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790113}