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The fix was copied from context_menu_egtest.mm which is to add a matcher
for context menu button.

Bug: 1106739
Change-Id: I1e89c3ccbc081aa0ff254a0a8bef535ed02054a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304963
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790046}