IDL: Simplify [TypeChecking=Interface] code generation

Source/bindings/scripts/v8_methods.py

Index: Source/bindings/scripts/v8_methods.py
diff --git a/Source/bindings/scripts/v8_methods.py b/Source/bindings/scripts/v8_methods.py
index bf0c407b0912c763a9d67cdc8c2c482944002eb0..bfb3770bbf5ad5903404a59fcb8632f1739d3958 100644
--- a/Source/bindings/scripts/v8_methods.py
+++ b/Source/bindings/scripts/v8_methods.py
@@ -198,12 +198,6 @@ def argument_context(interface, method, argument, index):
          has_extended_attribute_value(method, 'TypeChecking', 'Interface')) and
         idl_type.is_wrapper_type)
 
-    type_checked = (type_checking_interface and
-                    # These allow null and undefined values, so a type-check is still required.
-                    not idl_type.is_nullable and
-                    not (argument.is_optional and
-                         'Default' in extended_attributes))
-
     if ('ImplementedInPrivateScript' in extended_attributes and
         not idl_type.is_wrapper_type and
         not idl_type.is_basic_type):
@@ -245,7 +239,7 @@ def argument_context(interface, method, argument, index):
         'use_permissive_dictionary_conversion': 'PermissiveDictionaryConversion' in extended_attributes,
         'v8_set_return_value': v8_set_return_value(interface.name, method, this_cpp_value),
         'v8_set_return_value_for_main_world': v8_set_return_value(interface.name, method, this_cpp_value, for_main_world=True),
-        'v8_value_to_local_cpp_value': v8_value_to_local_cpp_value(argument, index, type_checked, return_promise=method.returns_promise),
+        'v8_value_to_local_cpp_value': v8_value_to_local_cpp_value(argument, index, return_promise=method.returns_promise),
         'vector_type': v8_types.cpp_ptr_type('Vector', 'HeapVector', idl_type.gc_type),
     }
 
@@ -372,14 +366,15 @@ def v8_value_to_local_cpp_variadic_value(argument, index, return_promise):
     return '%s%s(%s)' % (macro, suffix, ', '.join(macro_args))
 
 
-def v8_value_to_local_cpp_value(argument, index, type_checked, return_promise=False):
+def v8_value_to_local_cpp_value(argument, index, return_promise=False):
     extended_attributes = argument.extended_attributes
     idl_type = argument.idl_type
     name = argument.name
     if argument.is_variadic:
         return v8_value_to_local_cpp_variadic_value(argument, index, return_promise)
     return idl_type.v8_value_to_local_cpp_value(extended_attributes, 'info[%s]' % index,
-                                                name, needs_type_check=not type_checked, index=index, declare_variable=False, return_promise=return_promise)
+                                                name, index=index, declare_variable=False,
+                                                return_promise=return_promise)
 
 
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