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This hides all the server choice fields when "Choose another provider"
is not selected.  It also adjusts the label and removes the bottom
horizontal line, as requested.

Bug: 1106095
Change-Id: Ib362f5f2507235dd63c76d1fd857943425bb7f00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320131Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Ben Schwartz <bemasc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792143}