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Refactor the RequestPinView class to use a pair of callbacks instead of
the callback+delegate.

This refactoring makes the interface of the RequestPinView more compact,
which will simplify the introduction of alternative UI implementations
(for the Chrome OS Login and Lock screens) in follow-up CLs.

This is a pure refactoring, it's expected to bring no behavior changes.

Bug: 964069
Change-Id: I7d35592f7897b133d98f4dbc0657a19009ebb7d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722847
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Igor <igorcov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683334}