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This reverts commit 5f4895f5.

Reason for revert: First failure here:
https://ci.chromium.org/p/chrome/builders/ci/smoke/45194?blamelist=1#blamelist-tab

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}

TBR=sczs@chromium.org,thegreenfrog@chromium.org

Change-Id: I2c9c8f5eb609d72d56dcf4f6c69caab301a83ef6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 790886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368503Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800571}