Have DOMWindow deal with references instead of pointers when possible

Source/bindings/scripts/v8_callback_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 31 matching lines @@
 CALLBACK_INTERFACE_H_INCLUDES = frozenset([
     'bindings/v8/ActiveDOMCallback.h',
     'bindings/v8/DOMWrapperWorld.h',
     'bindings/v8/ScopedPersistent.h',
 ])
 CALLBACK_INTERFACE_CPP_INCLUDES = frozenset([
     'bindings/v8/V8Binding.h',
     'bindings/v8/V8Callback.h',
     'core/dom/ExecutionContext.h',
     'wtf/Assertions.h',
-    'wtf/GetPtr.h',  # FIXME: remove if can eliminate WTF::getPtr
+    'wtf/GetPtr.h',
     'wtf/RefPtr.h',
 ])
 
 
 def cpp_to_v8_conversion(idl_type, name):
     # FIXME: setting creation_context=v8::Handle<v8::Object>() is wrong,
     # as toV8 then implicitly uses the current context, which causes leaks
     # between isolate worlds if a different context should be used.
     cpp_value_to_v8_value = v8_types.cpp_value_to_v8_value(idl_type, name,
         isolate='m_isolate', creation_context='v8::Handle<v8::Object>()')
@@ skipping 69 matching lines @@
     argument_declarations = [
             '%s %s' % (cpp_type(argument.idl_type), argument.name)
             for argument in arguments]
     if call_with_this_handle:
         argument_declarations.insert(0, 'ScriptValue thisValue')
     return  {
         'argument_declarations': argument_declarations,
         'arguments': [generate_argument(argument) for argument in arguments],
         'handles': ['%sHandle' % argument.name for argument in arguments],
     }