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enable_run_ios_unittests_with_xctest ensures that the test target
type is ios_xctest_test. However, ie/ ios-beta-device, the unit
tests are actually not run with --xctest flag on.

To allow flexibility, we'll pass the --xctest flag in testing/
buildbot/ if needed, instead of mandating this, and to comply
with downstream behaviour.

Bug: 912681
Change-Id: I36769420792e7959a3e8873551b6968c770d1c97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368492
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#800643}