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Context menu is sometimes invoked for parent elements. f.e. a link can
be a parent element of an image and even though user has pressed on the
image, context menu is still shown for link, not for image.

This CL checks -webkit-touch-callout style on element it is about to
present a menu for (which can be a parent). Before the change
-webkit-touch-callout was always checked for a parent causing system
context menu to show up.

Bug: 736480
Change-Id: I9239d75a1bfd9926dd67d1c742763c56837b0c38
Reviewed-on: https://chromium-review.googlesource.com/578215
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488423}