Implement SSL server socket over OpenSSL.

1) Mixed ssl_server_socket_nss.cc and ssl_client_socket_openssl.cc.
2) Moved common functions into openssl_util.cc.
3) Enabled SslServerSocketTest when USE_OPENSSL is defined.

BUG=

Review URL: https://codereview.chromium.org/274783002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271218 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/socket/ssl_client_socket_openssl.h b/net/socket/ssl_client_socket_openssl.h
index 8ea2266..c5b7556 100644
--- a/net/socket/ssl_client_socket_openssl.h
+++ b/net/socket/ssl_client_socket_openssl.h
@@ -103,7 +103,7 @@
   friend class SSLClientSocket;
   friend class SSLContext;
 
-  bool Init();
+  int Init();
   void DoReadCallback(int result);
   void DoWriteCallback(int result);