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Splits up some globals and makes this a stand-alone dialog instead of a
child view to a catch-all password dialog. Uses a 6:4 ratio for
username/password rows. These ratios are always fixed and will not vary
based on content. This keeps the look consistent as the contents inside
the dialog changes.

Also fixes regression where additional padding is observed on the
right-hand side of the manage-passwords dialog.

TBR=vasilii@chromium.org

Bug: chromium:654115, chromium:784754
Change-Id: Ic3bc8cee08be90e0f4973fb6752eae355ecd0bb1
Reviewed-on: https://chromium-review.googlesource.com/724126
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523626}