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This CL removes CHECKs that were added to NavigationControllerImpl to
understand https://crbug.com/896028. It also transforms one of the original
CHECKs of CreateNavigationRequestFromLoadURLParams into a DCHECK: the
investigation determined that non-deterministic behavior of URL rewrites at the
content/ embedder layer caused this CHECK to not be enforceable.

Bug: 896028
Change-Id: Ica97b4c074a73e0259be764f6740a5f1d3c44414
Reviewed-on: https://chromium-review.googlesource.com/c/1329151Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609305}