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In chrome-distiller:// URLs, validate the URL parameter by adding
its hash as part of the host. This way, changing the URL parameter
requires changing the origin as well, so it's harder to be misused.

TBR=sky@chromium.org

Bug: 991888
Change-Id: Ida641f697d77a2c9c1a93266208a55c0e773aeaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763628
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693009}