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This CL adds a test to navigate back/forward to an error page and check
that the page correctly reloads.

Bug: none
Change-Id: I758c2cb5734fbbca9eb075e86e4ab3d44834ecdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615159Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841420}