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This CL adds UI and browser tests for the POPUPS content setting.
These tests are meant to replace the manual tests listed in the bug and
spreadsheet.

Bug: 1093253
Change-Id: Ic7ff67672224b3a8e429c9faab2fe37eb80da169
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2237980Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#778429}