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Implements the UrlRequestAction FIDL API, which allows embedders to
specify requests to block based on the the requests' host and/or scheme.

* Fix issue where wildcards passed in "hosts_filter" are URL-escaped.
* Add "page_type" edge transition detection to TestNavigationListener.
* Report early navigation errors in NavigationControllerImpl.

Bug: 1054475
Change-Id: If4df4889f980c5a239719d09f039eee32efd1c1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070103Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762033}