[automerger] Use BoringSSL to get random bytes am: 06eaa1c9cf am: ff81c1ef7a am: 93870fd67a am: d69c4765ff am: 3cc64e9af8
am: 2e1314f74f

Change-Id: I61052c64642d6d7917131268aed2f1460798f4cd