bindings: Makes the default receiver of callbacks "undefined".

Source/bindings/templates/callback_interface.cpp

 {% include 'copyright_block.txt' %}
 #include "config.h"
 {% filter conditional(conditional_string) %}
 #include "{{v8_class}}.h"
 
 {% for filename in cpp_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
@@ skipping 43 matching lines @@
         {{return_default}};
     }
     {% endfor %}
     {% if method.arguments %}
     v8::Local<v8::Value> argv[] = { {{method.arguments | join(', ', 'handle')}} };
     {% else %}
     {# Empty array initializers are illegal, and don't compile in MSVC. #}
     v8::Local<v8::Value> *argv = 0;
     {% endif %}
 
-    {% set this_handle_parameter = 'thisHandle, ' if method.call_with_this_handle else 'm_scriptState->context()->Global(), ' %}
+    {% set this_handle_parameter = 'thisHandle, ' if method.call_with_this_handle else 'v8::Undefined(m_scriptState->isolate()), ' %}
     {% if method.idl_type == 'boolean' %}
     v8::TryCatch exceptionCatcher;
     exceptionCatcher.SetVerbose(true);
     ScriptController::callFunction(m_scriptState->executionContext(), m_callback.newLocal(m_scriptState->isolate()), {{this_handle_parameter}}{{method.arguments | length}}, argv, m_scriptState->isolate());
     return !exceptionCatcher.HasCaught();
     {% else %}{# void #}
     ScriptController::callFunction(m_scriptState->executionContext(), m_callback.newLocal(m_scriptState->isolate()), {{this_handle_parameter}}{{method.arguments | length}}, argv, m_scriptState->isolate());
     {% endif %}
 }
 
 {% endfor %}
 } // namespace blink
 {% endfilter %}