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

Source/bindings/scripts/unstable/v8_callback_interface.py

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-"""Generate template values for a callback interface."""
+"""Generate template values for a callback interface.
+
+UNSTABLE: 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
+"""
 
 from v8_types import cpp_type, cpp_value_to_v8_value, includes_for_type
 from v8_utilities import v8_class_name
 
 CALLBACK_INTERFACE_H_INCLUDES = set([
     'bindings/v8/ActiveDOMCallback.h',
     'bindings/v8/DOMWrapperWorld.h',
     'bindings/v8/ScopedPersistent.h',
 ])
 CALLBACK_INTERFACE_CPP_INCLUDES = set([
@@ skipping 63 matching lines @@
         return {
             'name': argument.name,
             'cpp_to_v8_conversion': cpp_to_v8_conversion(argument.data_type, argument.name),
         }
 
     return  {
         'argument_declarations': [argument_declaration(argument) for argument in arguments],
         'arguments': [generate_argument(argument) for argument in arguments],
         'handles': ['%sHandle' % argument.name for argument in arguments],
     }