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This CL fixes the ErrorPageHelper detection of the original URL in an
error page URL.
It used to not used the same keyword as the creation method.

Bug: 991608
Change-Id: Ib826b879e539b5d21ccde2d6e92dbba7adccff49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027334Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737837}