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Removes usage of scoped_nsobject in ios/web/public.

Bug: 717540
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Icec9644b72efd0d57db00c4ed106575d5de59c9f
Reviewed-on: https://chromium-review.googlesource.com/846804Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526714}