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This is a reland of https://chromium-review.googlesource.com/c/595155
with a fix to a field that wasn't initialized.

Until we do https://crbug.com/458365 and remove the global session
cache, consumers making SSLClientSockets with the default empty shard
should not enable session caching, as they'll interact with other
sockets which do that.

Bug: 458365
Change-Id: Ib8d0ecf72584b687a768e080dc31439c625ac412
Reviewed-on: https://chromium-review.googlesource.com/598709
Commit-Queue: Steven Valdez <svaldez@chromium.org>
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491750}