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This change addresses an issue in which, when the context URL is not
available, popups continue to be blocked despite disabling popup
blocking.

Bug: 1128530
Change-Id: Ie25127f44da29a88e479ad1eca14ea3a69221b8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425127Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sam Sebree <sasebree@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#810788}