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FullscreenTestCase.testShowHeaderWhenChildTabCloses results in an
error when the child tab is closed, because the web view is invlaidated.
this behavior is expected, and should be verified. Add a helper to
tap on a web view element, which can return an NSError.

Bug: 807789
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I401319a1c19af60cdfd71e4fc6a75f36153e954b
Reviewed-on: https://chromium-review.googlesource.com/902792
Commit-Queue: Mike Baxley <baxley@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534849}