Prune OpenSSLInitSingleton.
Prune OpenSSLInitSingleton.

The destructor is unnecessary since it leaks anyway. Also don't bother setting
up error strings or locking callbacks. Error strings require no setup in
BoringSSL, and the threading callbacks are never called in favor of internal
pthreads logic.

BUG=none

Review URL: https://codereview.chromium.org/1192493002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#334735}

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