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Also remove tests from ios12 beta bot configuration.

Bug: 1007296,1010144
Change-Id: I109bbca01206acf181efcd44453badd2433bb14c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841831Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703018}