bindings: Remove the hidden prototype from HTMLDocument.

third_party/WebKit/Source/bindings/templates/interface_base.cpp

 {% include 'copyright_block.txt' %}
 #include "{{v8_class_or_partial}}.h"
 
 {% for filename in cpp_includes if filename != '%s.h' % cpp_class_or_partial %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 {% set visit_dom_wrapper = '%s::visitDOMWrapper' % v8_class
                            if has_visit_dom_wrapper else '0' %}
@@ skipping 283 matching lines @@
     ALLOW_UNUSED_LOCAL(signature);
     v8::Local<v8::ObjectTemplate> instanceTemplate = interfaceTemplate->InstanceTemplate();
     ALLOW_UNUSED_LOCAL(instanceTemplate);
     v8::Local<v8::ObjectTemplate> prototypeTemplate = interfaceTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
 
     {%- if not is_partial %}
     {% if interface_name == 'Window' %}{{newline}}
     prototypeTemplate->SetInternalFieldCount(V8Window::internalFieldCount);
     {% endif %}
-    {% if is_global or interface_name == 'HTMLDocument' %}{{newline}}
+    {% if is_global %}{{newline}}
     interfaceTemplate->SetHiddenPrototype(true);
     {% endif %}
     {% endif %}
 
     // Register DOM constants, attributes and operations.
     {% if runtime_enabled_function %}
     if ({{runtime_enabled_function}}()) {
     {% endif %}
     {% filter indent(4 if runtime_enabled_function else 0, true) %}
     {% if constants %}
@@ skipping 123 matching lines @@
 {{method_implemented_in_private_script(method)}}
 {% endfor %}
 {% for attribute in attributes if attribute.is_implemented_in_private_script %}
 {{attribute_getter_implemented_in_private_script(attribute)}}
 {% if attribute.has_setter %}
 {{attribute_setter_implemented_in_private_script(attribute)}}
 {% endif %}
 {% endfor %}
 {% block partial_interface %}{% endblock %}
 } // namespace blink