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These points were fanning out so much that text could not be selected
above or below a link. Reduce the distance between the touced point and
locations tested for a context menu element.

Additionally, fix the context_menu.html test page. The value of
webkit-touch-callout should be overridden to default. This broke when
the test page was moved to its own file in crrev.com/c/1543633, but the
test failure was covered up by the large spiralCoordinates used.

Bug: 1000611
Change-Id: If2c06f86c33bf7b8cb244c2e67e8c72df4b952bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828103
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700859}