Ignore mirrors without valid names.

tools/dom/src/html_native_DOMImplementation.dart

 // 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.
 
 part of html;
 
 class _Property {
   _Property(this.name) :
       _hasValue = false,
       writable = false,
@@ skipping 580 matching lines @@
     _addStatics(classMirror, properties, accessorPropertiesOnly);
     return packageProperties(properties);
   }
 
   static void _addStatics(ClassMirror classMirror,
                           Map<String, _Property> properties,
                           bool accessorPropertiesOnly) {
     var libraryMirror = classMirror.owner;
     classMirror.declarations.forEach((symbol, declaration) {
       var name = _getShortSymbolName(symbol, declaration);
+      if (name.isEmpty) return;
       if (declaration is VariableMirror) {
         if (accessorPropertiesOnly) return;
         if (!declaration.isStatic) return;
         properties.putIfAbsent(name, () => new _Property(name))
             ..value = classMirror.getField(symbol).reflectee
             ..writable = !declaration.isFinal && !declaration.isConst;
       } else if (declaration is MethodMirror) {
         MethodMirror methodMirror = declaration;
         // FIXMEDART: should we display constructors?
         if (methodMirror.isConstructor) return;
@@ skipping 57 matching lines @@
   static void _addInstanceMirrors(
       ObjectMirror objectMirror,
       LibraryMirror libraryMirror,
       Map<Symbol, Mirror> declarations,
       bool ownProperties, bool accessorPropertiesOnly,
       bool hideFields, bool hideMethods,
       Map<String, _Property> properties) {
     declarations.forEach((Symbol symbol, Mirror declaration) {
       if (declaration is TypedefMirror || declaration is ClassMirror) return;
       var name = _getShortSymbolName(symbol, declaration);
+      if (name.isEmpty) return;
       bool isField = declaration is VariableMirror ||
           (declaration is MethodMirror &&
               treatPropertyAsField(declaration, libraryMirror));
       if ((isField && hideFields) || (hideMethods && !isField)) return;
       if (accessorPropertiesOnly) {
         if (declaration is VariableMirror || declaration.isRegularMethod ||
             isField) {
           return;
         }
       } else if (declaration is MethodMirror &&
@@ skipping 290 matching lines @@
   _scheduleImmediateHelper._schedule(callback);
 };
 
 get _pureIsolateScheduleImmediateClosure => ((void callback()) =>
   throw new UnimplementedError("scheduleMicrotask in background isolates "
                                "are not supported in the browser"));
 
 void _initializeCustomElement(Element e) {
   _Utils.initializeCustomElement(e);
 }