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- Adds is_form_navigation member to the NavigationDetails struct. This
struct is sent to the InfobarDelegate after each Navigation.
- Dismisses the SaveCard Infobar unless the navigation was triggered
by a form submission or is a redirect.
- Creates kAutofillSaveCardDismissOnNavigation feature flag for the new
behaviour.

Bug: 1021412
Change-Id: I6cf5973a635586a8f21d65a50bb750a4ea0c4070
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890734
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712853}