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This CL makes web requests that require client certificates
wait until the client certificate storage is loaded. Without
that they proceed as if there is no suitable certificate and
the browser doesn't retry to find a certificate for the same
connection (including on the page refresh).

Add a method to CertDbInitializer that allows to wait for the
initialization to finish. Wrap the base ClientCertStoreNSS
class into a new class and wait in it for the initialization to
finish before continuing the retrieval of client certificates.

Bug: 1145946
Change-Id: I1f5ab87d93c3eedea75f86a9769dcaddb0cd8404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574757Reviewed-by: Michael Ershov <miersh@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#836434}