Delete unused file.

common/lib/xmodule/xmodule/open_ended_grading_classes/xblock_field_types.py

-from xblock.core import Integer, Float
-
-
-class StringyFloat(Float):
-    """
-    A model type that converts from string to floats when reading from json
-    """
-
-    def from_json(self, value):
-        try:
-            return float(value)
-        except:
-            return None
-

common/lib/xmodule/xmodule/xml_module.py

@@ -155,7 +155,6 @@ class XmlDescriptor(XModuleDescriptor):
         Remove any attribute named in cls.metadata_attributes from the supplied
         xml_object
         """
-        #       TODO: change to use Fields definitions
         for attr in cls.metadata_attributes:
             if xml_object.get(attr) is not None:
                 del xml_object.attrib[attr]