Extract common logic for element factory constructors generation.

lib/dom/scripts/systemnative.py

Index: lib/dom/scripts/systemnative.py
diff --git a/lib/dom/scripts/systemnative.py b/lib/dom/scripts/systemnative.py
index a44b30f45b40c44ce27cc7b74b7a8fed874bc62c..bb99731a298c52cfdedc9a21a32a3bfe381eb6a7 100644
--- a/lib/dom/scripts/systemnative.py
+++ b/lib/dom/scripts/systemnative.py
@@ -229,6 +229,9 @@ class NativeImplementationGenerator(systembase.BaseGenerator):
     self._html_system = self._system._html_system
     self._html_renames = self._html_system._html_renames
 
+  def FactoryConstructorElementClassName(self):
+    return self._HTMLInterfaceName(self._interface.id)
+
   def StartInterface(self):
     self._interface_type_info = GetIDLTypeInfo(self._interface.id)
     self._members_emitter = emitter.Emitter()
@@ -242,9 +245,6 @@ class NativeImplementationGenerator(systembase.BaseGenerator):
 
   def _GenerateConstructors(self):
     html_interface_name = self._HTMLInterfaceName(self._interface.id)
-    infos = HtmlElementConstructorInfos(html_interface_name)
-    if infos:
-      self._EmitHtmlElementFactoryConstructors(infos, html_interface_name)
 
     if not self._IsConstructable():
       return
@@ -342,14 +342,6 @@ class NativeImplementationGenerator(systembase.BaseGenerator):
         raises_exceptions=raises_exceptions,
         runtime_check=runtime_check)
 
-  def _EmitHtmlElementFactoryConstructors(self, infos, html_interface_name):
-    EmitHtmlElementFactoryConstructors(
-        self._system._EmitterForFactoryProviderBody(
-            infos[0].factory_provider_name),
-        infos,
-        html_interface_name,
-        html_interface_name)
-
   def _GenerateEvents(self):
     if self._interface.id == 'DocumentFragment':
       # Interface DocumentFragment extends Element in dart:html but this fact