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In the omnibox we should show the original article's URL for distilled
pages, but if the distilled URL is invalid then we should continue
to show the dom-distiller:// URL rather than nothing.

This might happen if a user types in a URL beginning with
dom-distiller://. We do not want users to try to navigate directly to
dom-distiller pages, but we should handle the omnibox well when they
do.

Bug: 1066552
Change-Id: I7e569b74c49f9c5557647635f53815f724c8ce33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129900
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757603}