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The permission wizard had a multi-purpose "Next" button whose text and
behavior were adjusted, depending on the wizard state. Resizing the
button sometimes caused rendering glitches in the bezel outline.

This CL simplifies things by creating separate buttons (and event
handlers) for each purpose, and it shows/hides them instead of
replacing the title strings.

This CL also enables/disables the "Next" button (according to
permission grant state), so that the buttons don't jump around as much.
The "Open .. preferences" button and "Next" buttons remain visible, but
the user can still only advance when permission is granted.

Bug: 1015201
Change-Id: I255fcc8bc3f8c18acfef0dc830964c40dd081e98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949673
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721278}