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This adds a |DidFinishNavigation| method to InsecureInputTabHelper, which
clears the SSL user data for committed navigations that aren't same-document
(where form input is still retained). When a user enters text in a form on
an HTTP page, the security state is downgraded to the "dangerous triangle"
icon -- clearing the SSL user data causes this state to correctly reset on
when reloading the page.

Bug: 810374
Change-Id: I95456131689de9653688ab5d4061d338f92fa4e3
Reviewed-on: https://chromium-review.googlesource.com/c/1292055
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605093}