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This CL changes the key used in the error to pass the URL of the failed
navigation as it is not the one used in the rest of the navigation code.

Fixed: 1140976
Change-Id: I752feef45742477ca38f9e3e89f3921378889f28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550674Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831013}