Implement SSLClientSocket::GetMaxSupportedSSLVersion, this time without breaking the build.

Implement SSLClientSocket::GetMaxSupportedSSLVersion, this time without breaking
the build.

This is the first step to stop advertising HTTP/2 when we do not support TLS
1.2.

Patch Set 1 originally landed as https://crrev.com/742473004.  It broke the
build on Linux Builder (dbg)(32) and was reverted.  Let's try again.

BUG=436835

Review URL: https://codereview.chromium.org/768413002

Cr-Commit-Position: refs/heads/master@{#306506}
diff --git a/net/socket/ssl_client_socket_openssl.cc b/net/socket/ssl_client_socket_openssl.cc
index 2e8ba87..b417e13 100644
--- a/net/socket/ssl_client_socket_openssl.cc
+++ b/net/socket/ssl_client_socket_openssl.cc
@@ -344,6 +344,11 @@
   context->session_cache()->Flush();
 }
 
+// static
+uint16 SSLClientSocket::GetMaxSupportedSSLVersion() {
+  return SSL_PROTOCOL_VERSION_TLS1_2;
+}
+
 SSLClientSocketOpenSSL::SSLClientSocketOpenSSL(
     scoped_ptr<ClientSocketHandle> transport_socket,
     const HostPortPair& host_and_port,