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DMServer dropped support for iOS recently and also
IOS_BROWSER is removed from registration types.

Change-Id: Iaa8e5619a1f85110d8d76744a711999f09fb0580
Reviewed-on: https://chromium-review.googlesource.com/c/1273070Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599212}