Removed an redundant import from the Oracle backend. Thanks to Ramiro Morales for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9745 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/oracle/query.py

@@ -53,7 +53,6 @@ def query_class(QueryClass, Database):
             return values
 
         def convert_values(self, value, field):
-            from django.db.models.fields import Field
             if isinstance(value, Database.LOB):
                 value = value.read()
             # Oracle stores empty strings as null. We need to undo this in