fix some 2to3 breakage on the cx_oracle dialect

lib/sqlalchemy/dialects/oracle/cx_oracle.py

@@ -122,6 +122,8 @@ class _LOBMixin(object):
         return process
 
 class _NativeUnicodeMixin(object):
+    # Py3K
+    #pass
     # Py2K
     def bind_processor(self, dialect):
         if dialect._cx_oracle_with_unicode:
@@ -509,7 +511,6 @@ class OracleDialect_cx_oracle(OracleDialect):
             for k, v in opts.items():
                 if isinstance(v, unicode):
                     opts[k] = str(v)
-          
         # end Py2K
 
         if 'mode' in url.query: