IDL: Add PropertyBag class

Source/bindings/scripts/v8_dictionary.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generate template contexts of dictionaries for both v8 bindings and
 implementation classes that are used by blink's core/modules.
 """
 
 import operator
 from v8_globals import includes
 import v8_types
 import v8_utilities
 
 
 DICTIONARY_H_INCLUDES = frozenset([
     'bindings/core/v8/V8Binding.h',
     'platform/heap/Handle.h',
 ])
 
 DICTIONARY_CPP_INCLUDES = frozenset([
-    # FIXME: Remove this, http://crbug.com/321462
-    'bindings/core/v8/Dictionary.h',
+    'bindings/core/v8/PropertyBag.h',
 ])
 
 
 def setter_name_for_dictionary_member(member):
     return 'set%s' % v8_utilities.capitalize(member.name)
 
 
 def has_method_name_for_dictionary_member(member):
     return 'has%s' % v8_utilities.capitalize(member.name)
 
@@ skipping 94 matching lines @@
         'getter_expression': getter_expression(),
         'has_method_expression': has_method_expression(),
         'has_method_name': has_method_name_for_dictionary_member(member),
         'is_traceable': (idl_type.is_garbage_collected or
                          idl_type.is_will_be_garbage_collected),
         'member_cpp_type': member_cpp_type(),
         'name': member.name,
         'rvalue_cpp_type': idl_type.cpp_type_args(used_as_rvalue_type=True),
         'setter_name': setter_name_for_dictionary_member(member),
     }