Add OWNERS file for ios components

Bug: None
Change-Id: Idceb31b8ba0d4beb44bfd4f2d16a1faa5b8e531d
Reviewed-on: https://chromium-review.googlesource.com/600028Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491857}

ios/components/OWNERS

+eugenebut@chromium.org
+michaeldo@chromium.org
+sdefresne@chromium.org
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