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This CL extracts the JavaScript logic to find the DOM element on which
the user is long pressing and creating the ContextMenuParams out of it.

It is also renaming HTMLElementFetchRequest in
CRWHTMLElementFetchRequest to respect ios/web standard.

Bug: 1140387
Change-Id: I62e6e2df9be54f67706ff440354912b00d77337c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580073
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841459}