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This CL fixes some bugs in the cert selction logic and adds some
code cleanup:
* Caches 'type_' which can not change.
* Associates connect/save enable with a new isConfigured_ property.

Bug: 380937
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I84c714b0a28eb552ee923feb6db20da2f69a7e2c
Reviewed-on: https://chromium-review.googlesource.com/687877Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504855}