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If the user has already entered data into a form and the frame containing it
is detached, prompt to save. This fixes password saving on Sears.com, as
they perform authentication by removing an iframe containing the login information when submission is successful.

BUG=450806

Review URL: https://codereview.chromium.org/1012093005

Cr-Commit-Position: refs/heads/master@{#321486}