Remove code interfacing legacy openssl.

BUG=

Review URL: https://codereview.webrtc.org/1808763002

Cr-Original-Commit-Position: refs/heads/master@{#12041}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4cd331beade6de16c073dcdaf89c4e038bdbf73f
6 files changed