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This CL makes sure that the documentURL is correctly updated, or is not
updated when the user is reloading an error page with the new workflow.

Bug: 1139303
Change-Id: I11d5f70eeb58077c0ed40f0b183c3f762f749ab8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514205
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823485}