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This CL adds OverlayRequestCancelHandler, an object supplied to the
OverlayRequestQueue that can cancel an individual request.  A default
option is available that cancels requests for all committed, document-
changing navigations.  Other overlays that may want to cancel using
different heuristics can supply a custom cancel handler subclass.

Bug: 1005613
Change-Id: I1113e26a52f9b910195be2a5a35416f3cc994dc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1812362
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699487}