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The server template never got updated on a previous format change, but
still managed to compile.  Add a validation in the constructor to ensure
only valid server templates are listed.  Also add a test to make sure
the list can be loaded without error (not completely necessary since
other tests load the list, but a specific test helps make it extra
obvious).

Bug: 1065338
Change-Id: Ie2b131a37bf7bd82c46747b5ab4e67d5b2f7eb7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153319
Commit-Queue: Eric Orth <ericorth@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: Eric Orth <ericorth@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759803}