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The goal of this CL is to provide a sample call site for
base::NoDestructor.

SslIndexSingleton does nothing in its destructor, so not registering
with AtExitManager doesn't affect behavior.

Change-Id: I19c334faa7148c8f0340c370c854272023fc3950
Reviewed-on: https://chromium-review.googlesource.com/879103Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Buck Krasic <ckrasic@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531979}