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Bug https://crbug.com/1018385 is caused by navigation initially
classified as "same-document" committing error pages.

During the commit phase of the navigation, the NavigationRequest is
transfered in one of these RenderFrameHostImpl's bucket:
 - same_document_navigation_request_
 - navigation_requests_

A navigation classified as "same-document" ends up in the bucket
incompatible with error pages.
DidCommitPerNavigationMojoInterfaceNavigation expects to find the
navigation is the other bucket.

Add several regressions tests, including WPT tests.

Bug: 1018385
Change-Id: I3d92af1dd487f7b60a3e50a792716a07b074e5eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886339
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712541}