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Our previous approach of disabling back-forward cache proved to be too
aggressive. Instead, this patch adds a check that the popups would not
be shown on behalf of the inactive frames and removes the old blocklist logic.

R=sreejakshetty@chromium.org,vasilii@chromium.org,fhorschig@chromium.org
BUG=1031076,1017693

Change-Id: I220eab19c17f9821d86b7be5ee83a7af7e674c2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995166
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730309}