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Improve Context Menu EarlGrey tests to reduce flakiness.

Bug: 817810
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I0b8847322c6cae9d53421a7778b1852e8a1a0a43
Reviewed-on: https://chromium-review.googlesource.com/1055802
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557980}