Stop passing HtmlSystemShared around and move html renaming to IDLTypeInfo.

lib/dom/scripts/systemfrog.py

Index: lib/dom/scripts/systemfrog.py
diff --git a/lib/dom/scripts/systemfrog.py b/lib/dom/scripts/systemfrog.py
index 9f37a70656041a5582115a43b3444a8ef27998d0..cf824ff18adce325220fe4b98210583c987b4722 100644
--- a/lib/dom/scripts/systemfrog.py
+++ b/lib/dom/scripts/systemfrog.py
@@ -155,31 +155,28 @@ class FrogInterfaceGenerator(BaseGenerator):
 
   def _ShouldNarrowToImplementationType(self, type_name):
     # TODO(sra): Move into the 'system' and cache the result.
-    if type_name == 'EventListener':
-      # Callbacks are typedef functions so don't have a class.
+    do_not_narrow = ['DOMStringList', 'DOMStringMap', 'EventListener',
+                     'IDBAny', 'IDBKey', 'MediaQueryListListener']
+    if type_name in do_not_narrow:
       return False
     if self._system._database.HasInterface(type_name):
       interface = self._system._database.GetInterface(type_name)
       if RecognizeCallback(interface):
         # Callbacks are typedef functions so don't have a class.
         return False
-      elif type_name == 'MediaQueryListListener':
-        # Somewhat like a callback.  See Issue 3338.
-        return False
-      else:
-        return True
+      return True
     return False
 
   def _NarrowToImplementationType(self, type_name):
     if self._ShouldNarrowToImplementationType(type_name):
-      return self._ImplClassName(type_name)
-    return type_name
+      return self._ImplClassName(DartType(type_name))
+    return DartType(type_name)
 
   def _NarrowInputType(self, type_name):
-    return self._NarrowToImplementationType(DartType(type_name))
+    return self._NarrowToImplementationType(type_name)
 
   def _NarrowOutputType(self, type_name):
-    return self._NarrowToImplementationType(DartType(type_name))
+    return self._NarrowToImplementationType(type_name)
 
   def AddConstant(self, constant):
     # Since we are currently generating native classes without interfaces,