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This CL also removes the outdated comments on
mojom::NavigationParams::navigation_start.

Bug: n/a
Change-Id: I4672611f52d861b797f2a472496813da6de35875
Tbr: kinuko@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132069
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758771}