[bindings] partial interfaces should not violate componentization

Source/bindings/scripts/v8_attributes.py

Index: Source/bindings/scripts/v8_attributes.py
diff --git a/Source/bindings/scripts/v8_attributes.py b/Source/bindings/scripts/v8_attributes.py
index bc4355c732fdd9107047fdd63c353c8f7f4ab40b..b9972b2c771293fe6b692f164f28b607f0b9fe6d 100644
--- a/Source/bindings/scripts/v8_attributes.py
+++ b/Source/bindings/scripts/v8_attributes.py
@@ -429,14 +429,20 @@ def scoped_content_attribute_name(interface, attribute):
 # [Replaceable]
 def setter_callback_name(interface, attribute):
     cpp_class_name = cpp_name(interface)
+    namespace_name = [cpp_class_name]
+    if interface.original_interface:
+        namespace_name.append('Partial')
+    namespace_name.append('V8Internal')
+
     extended_attributes = attribute.extended_attributes
     if (('Replaceable' in extended_attributes and
          'PutForwards' not in extended_attributes) or
         is_constructor_attribute(attribute)):
-        return '{0}V8Internal::{0}ForceSetAttributeOnThisCallback'.format(cpp_class_name)
+        return '%s::%sForceSetAttributeOnThisCallback' % (
+            ''.join(namespace_name), cpp_class_name)
     if attribute.is_read_only and 'PutForwards' not in extended_attributes:
         return '0'
-    return '%sV8Internal::%sAttributeSetterCallback' % (cpp_class_name, attribute.name)
+    return '%s::%sAttributeSetterCallback' % (''.join(namespace_name), attribute.name)
 
 
 # [DoNotCheckSecurity], [Unforgeable]