Remove GetTLSUniqueChannelBinding.

net/socket/ssl_client_socket_openssl.cc

Index: net/socket/ssl_client_socket_openssl.cc
diff --git a/net/socket/ssl_client_socket_openssl.cc b/net/socket/ssl_client_socket_openssl.cc
index 92cc0fe1e53801cacec443f12389393a4ca1db89..c78090bfb13badbe5f2f27c7fe4fea2958ccdff1 100644
--- a/net/socket/ssl_client_socket_openssl.cc
+++ b/net/socket/ssl_client_socket_openssl.cc
@@ -602,11 +602,6 @@ int SSLClientSocketOpenSSL::ExportKeyingMaterial(
   return OK;
 }
 
-int SSLClientSocketOpenSSL::GetTLSUniqueChannelBinding(std::string* out) {
-  NOTIMPLEMENTED();
-  return ERR_NOT_IMPLEMENTED;
-}
-
 int SSLClientSocketOpenSSL::Connect(const CompletionCallback& callback) {
   // It is an error to create an SSLClientSocket whose context has no
   // TransportSecurityState.