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This CL prevents same-document navigations such as history.pushState and
fragment navigations from resulting in a closed Safety Tip.

Fixed: 1137661
Change-Id: Id0125055147d50c936c26a8763839e1f47244f8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468189Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816832}