Make html metadata follow the spec.

tools/dom/scripts/htmldartgenerator.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
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 34 matching lines @@
       else:
         signature = check[0]
         check = check[1]
       self._members_emitter.Emit('\n'
           '  /// Checks if this type is supported on the current platform.\n'
           '  static bool $SIGNATURE => $SUPPORT_CHECK;\n',
           SIGNATURE=signature, SUPPORT_CHECK=check)
 
   def EmitEventGetter(self, events_class_name):
     self._members_emitter.Emit(
-        "\n  @DocsEditable"
+        "\n  @DocsEditable()"
         "\n  @DomName('EventTarget.addEventListener, "
         "EventTarget.removeEventListener, EventTarget.dispatchEvent')"
         "\n  @deprecated"
         "\n  $TYPE get on =>\n    new $TYPE(this);\n",
         TYPE=events_class_name)
 
   def AddMembers(self, interface, declare_only=False):
     for const in sorted(interface.constants, ConstantOutputOrder):
       self.AddConstant(const)
 
@@ skipping 527 matching lines @@
     if interface.parents:
       parent = interface.parents[0]
       if IsPureInterface(parent.type.id):
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
     return result
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)