Fix Polymer licensing issues

third_party/web-animations-js/sources/src/animation-node.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(shared, scope) {
-
-  scope.AnimationNode = function(timing) {
-    var timeFraction = 0;
-    var activeDuration = shared.calculateActiveDuration(timing);
-    var animationNode = function(localTime) {
-      return shared.calculateTimeFraction(activeDuration, localTime, timing);
-    };
-    animationNode._totalDuration = timing.delay + activeDuration + timing.endDelay;
-    animationNode._isCurrent = function(localTime) {
-      var phase = shared.calculatePhase(activeDuration, localTime, timing);
-      return phase === PhaseActive || phase === PhaseBefore;
-    };
-    return animationNode;
-  };
-
-})(webAnimationsShared, webAnimations1);