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This is a reland of 5f4895f5

Original change's description:
> [ios] Turn on FullscreenControllerBrowserScoped by default
>
> Bug: 790886
> Change-Id: Ide1eee5634376b90cfa820bb61644c871969ff86
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358589
> Reviewed-by: Sergio Collazos <sczs@chromium.org>
> Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
> Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800354}

Bug: 790886
Change-Id: I24ea5c47f97e1060dc1c2dd4e83f4447595611b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380138
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804959}