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Converts disocvery and confirmation pages to use the page template for
consistent behaviour and reduced css. There should be no change in
behavior.

Change-Id: I8382befed448e6bb1b94e020717cb127950eeaee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423350
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809614}