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Removes mentions of iOS <10 and removes one unnecessary if-condition.

Bug: None
Test: None
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I14b5e26b5b311011f3430fad813c164a8c682a27
Reviewed-on: https://chromium-review.googlesource.com/893186
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537332}