GitLab

"Close Firefox..." no longer mentions Chromium or Google Chrome so it
can be used as a generic string. This fixes the current mismatch between
Chromium/Google Chrome as only the former was updated for the new dialog
string.

Bug: chromium:754034
Change-Id: I4cfcf53057be681142ea8684a40b6b3eee33e436
Reviewed-on: https://chromium-review.googlesource.com/745310Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513072}