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If a navigation entry was marked as skippable because it added an entry
using pushState, then a user gesture on the page should reset the skippable
bit. If the pushState was done after the user gesture, then the entry would
not have been marked as skippable to begin with. This change will make the
behavior independent of the ordering between user gesture and pushState.

content_browsertests --gtest_filter=
NavigationControllerHistoryInterventionBrowserTest.
OnUserGestureResetSameDocumentEntriesSkipFlag
content_browsertests --gtest_filter=
NavigationControllerHistoryInterventionBrowserTest.
OnUserGestureDoNotResetDifferentDocumentEntrySkipFlag

Test: 
Bug: 937423
Change-Id: Ie1e55815163ca84950ed7e04fbfa55c06f86c2cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1499834
Commit-Queue: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638641}