Harmonize password save-confirmation view.

Makes ManagePasswordSaveConfirmationView a stand-alone dialog and
applies the following changes for Harmony:

* Adds optional title casing for dialog title and button.
* Removes OK button in favor of showing a standard close button.

Bug: chromium:654115
Change-Id: Ie09df62dd03cb4687d2d33df1957fd2426557eb9
Reviewed-on: https://chromium-review.googlesource.com/865536
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530187}
6 files changed