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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: Ib8bb5cc6fb51240c4e9a89184ab51775e9653168
Reviewed-on: https://chromium-review.googlesource.com/595155
Commit-Queue: Steven Valdez <svaldez@chromium.org>
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491118}