Revert IDL compiler build flow to Perl, rename 'deprecated'

Source/bindings/scripts/unstable/v8_attributes.py

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-"""Generate template values for attributes."""
+"""Generate template values for attributes.
+
+FIXME: Not currently used in build.
+This is a rewrite of the Perl IDL compiler in Python, but is not complete.
+Once it is complete, we will switch all IDL files over to Python at once.
+Until then, please work on the Perl IDL compiler.
+For details, see bug http://crbug.com/239771
+"""
 
 import v8_types
 import v8_utilities
 from v8_utilities import cpp_method_name, generate_conditional_string, uncapitalize
 
 
 def generate_attributes(interface):
     def generate_attribute(attribute):
         attribute_contents, attribute_includes = generate_attribute_and_includes(attribute)
         includes.update(attribute_includes)
@@ skipping 31 matching lines @@
     contents = {
         'name': attribute.name,
         'conditional_string': generate_conditional_string(attribute),
         'cpp_method_name': cpp_method_name(attribute),
         'cpp_type': v8_types.cpp_type(idl_type, pointer_type='RefPtr'),
         'should_keep_attribute_alive': should_keep_attribute_alive,
         'return_v8_value_statement': return_v8_value_statement,
         'v8_type': v8_types.v8_type(idl_type),
     }
     return contents, includes