Extend ScalarValueString handling to include constructors.

Source/bindings/scripts/v8_types.py

Index: Source/bindings/scripts/v8_types.py
diff --git a/Source/bindings/scripts/v8_types.py b/Source/bindings/scripts/v8_types.py
index 5f735af235cb5f6e211589cff8830bd9a92df915..b41e9cb020c1d7be7f1a7ceefa49264a6cccf44b 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -417,8 +417,7 @@ def v8_value_to_cpp_value(idl_type, extended_attributes, v8_value, index):
 
     if 'EnforceRange' in extended_attributes:
         arguments = ', '.join([v8_value, 'EnforceRange', 'exceptionState'])
-    elif (idl_type.is_integer_type or  # NormalConversion
-          idl_type.name in ('ByteString', 'ScalarValueString')):
+    elif idl_type.may_raise_exception_on_conversion:
         arguments = ', '.join([v8_value, 'exceptionState'])
     else:
         arguments = v8_value
@@ -466,8 +465,7 @@ def v8_value_to_local_cpp_value(idl_type, extended_attributes, v8_value, variabl
     args = [variable_name, cpp_value]
     if idl_type.base_type == 'DOMString' and not idl_type.array_or_sequence_type:
         macro = 'TOSTRING_VOID'
-    elif (idl_type.is_integer_type or
-          idl_type.name in ('ByteString', 'ScalarValueString')):
+    elif idl_type.may_raise_exception_on_conversion:
         macro = 'TONATIVE_VOID_EXCEPTIONSTATE'
         args.append('exceptionState')
     else: