Fix Polymer licensing issues

third_party/web-animations-js/sources/src/property-names.js

-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-//     You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//     See the License for the specific language governing permissions and
-// limitations under the License.
-
-(function(scope, testing) {
-
-  var aliased = {};
-
-  function alias(name, aliases) {
-    aliases.concat([name]).forEach(function(candidate) {
-      if (candidate in document.documentElement.style) {
-        aliased[name] = candidate;
-      }
-    });
-  }
-  alias('transform', ['webkitTransform', 'msTransform']);
-  alias('transformOrigin', ['webkitTransformOrigin']);
-  alias('perspective', ['webkitPerspective']);
-  alias('perspectiveOrigin', ['webkitPerspectiveOrigin']);
-
-  scope.propertyName = function(property) {
-    return aliased[property] || property;
-  };
-
-})(webAnimations1, webAnimationsTesting);