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This CL changes ProfilePickerView to use it's custom widget class
instead of the default one provided by DialogDelegate. This allows to
define a theme provider for the widget, based on a profile that
(sometimes) gets created throughout profile creation flow.

This is a preparatory CL for later CLs (such as CL 2569752) that will
add native views into the hierarchy that actually rely on the theme
provider.

Bug: 1126913
Change-Id: Ifed3f645a4c60035ced4b7562ab21f5d4d5b840a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2608206Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841396}