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Revert of [ObjC ARC] Converts ios/chrome/browser/ui/toolbar:toolbar to ARC. (patchset #3 id:40001 of https://codereview.chromium.org/2808873002/ )

Reason for revert:
Reverting since ios_chrome_smoke_egtests its failing and it broke the autoroller.

https://uberchromegw.corp.google.com/i/internal.bling.main/builders/chromium-autoroller/builds/373/steps/ios_chrome_smoke_egtests%20%28iPhone%205s%20iOS%2010.0%29/logs/stdio

Original issue's description:
> [ObjC ARC] Converts ios/chrome/browser/ui/toolbar:toolbar to ARC.
>
> Automatically generated ARCMigrate commit
> Notable issues:None
> BUG=624363
> TEST=None
>
> Review-Url: https://codereview.chromium.org/2808873002
> Cr-Commit-Position: refs/heads/master@{#467947}
> Committed: https://chromium.googlesource.com/chromium/src/+/8b6e180812e904c59ff0d72a3b2d4d8df7d7f37b

TBR=stkhapugin@chromium.org,sdefresne@chromium.org,gambard@chromium.org,olivierrobin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624363

Review-Url: https://codereview.chromium.org/2852713002
Cr-Commit-Position: refs/heads/master@{#467981}