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Messaging from chrome url pages was broken when the page was loaded by
navigating from chrome://chrome-urls because the webUI object was being
cleared in
|CRWWKNavigationHandler webView:didStartProvisionalNavigation|.

Navigating to an app specific URL is only allowed in certain
situations, one of which is when the page is loaded by clicking a link
on another app specific URL. So, update the logic to handle this
scenario.

Bug: 1140780
Change-Id: I9fbdca65487ce7c3e287922f1c98fa11da1c2d0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518192
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826898}