Remove blink_jsObject when --gen-interop is not used.

tools/dom/scripts/systemhtml.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the system to generate
 Dart:html APIs from the IDL database."""
 
 import emitter
 import logging
@@ skipping 653 matching lines @@
         self._library_name)
     self._backend.AddConstructors(
         constructors, factory_provider, factory_constructor_name)
 
     isElement = False
     for parent in self._database.Hierarchy(self._interface):
       if parent.id == 'Element':
         isElement = True
 
     # Write out the JsInterop code.
-    if implementation_members_emitter and self._options.templates._conditions['DARTIUM']:
+    if (implementation_members_emitter and
+        self._options.templates._conditions['DARTIUM'] and
+        self._options.dart_js_interop):
       implementation_members_emitter.Emit(js_interop_wrapper)
 
     if isElement and self._interface.id != 'Element':
       implementation_members_emitter.Emit(
           '  /**\n'
           '   * Constructor instantiated by the DOM when a custom element has been created.\n'
           '   *\n'
           '   * This can only be called by subclasses from their created constructor.\n'
           '   */\n'
           '  $CLASSNAME.created() : super.created();\n',
@@ skipping 678 matching lines @@
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def AddTypeEntry(self, library_name, idl_name, dart_name):
     self._libraries[library_name].AddTypeEntry(idl_name, dart_name)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)