Use the new API to set the BoringSSL time callback.

Review-Url: https://codereview.webrtc.org/2070693003
Cr-Original-Commit-Position: refs/heads/master@{#13224}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: d685fef94c2b4268b205a3bb08b3c4ff4c25fbfc
1 file changed