GitLab

OnJavascriptDisallowed does not get called to remove the observer if
the incognito ntp tab is closed, which can result in a crash (see bug).
To fix this, add RemoveObserver call to the destructor.

Bug: 1058769
Change-Id: I18413d0ae54593adc032aa017f39f5787bd5bc31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088713
Commit-Queue: Ehimare Okoyomon <eokoyomon@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747692}