Strip unused functionality from dart:html and fix strong mode errors. Switch from blacklisting pure…

tools/dom/scripts/systemnative.py

Index: tools/dom/scripts/systemnative.py
diff --git a/tools/dom/scripts/systemnative.py b/tools/dom/scripts/systemnative.py
index 1f5a030fc6a581a4e7d0be8b5653a33e8b038bf0..f6284abc7dae626ef33f8fc9125448d34708086a 100644
--- a/tools/dom/scripts/systemnative.py
+++ b/tools/dom/scripts/systemnative.py
@@ -193,7 +193,7 @@ class DartiumBackend(HtmlDartGenerator):
 
   def StartInterface(self, members_emitter):
     # Create emitters for c++ implementation.
-    if not IsPureInterface(self._interface.id) and \
+    if not IsPureInterface(self._interface.id, self._database) and \
         not IsCustomType(self._interface.id):
       self._cpp_header_emitter = self._cpp_library_emitter.CreateHeaderEmitter(
         self._interface.id,
@@ -951,7 +951,7 @@ class DartiumBackend(HtmlDartGenerator):
         full_dart_name = \
             self.DeriveQualifiedBlinkName(self._interface.id,
                                           dart_native_name)
-        if IsPureInterface(self._interface.id):
+        if IsPureInterface(self._interface.id, self._database):
             caller_emitter.Emit(
                 '\n'
                 '  $METADATA$DART_DECLARATION;\n',