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third_party/polymer/components/neon-animation/neon-shared-element-animation-behavior.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
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     },
 
     /**
      * Finds shared elements based on `config`.
      */
     findSharedElements: function(config) {
       var fromPage = config.fromPage;
       var toPage = config.toPage;
       if (!fromPage || !toPage) {
-        Polymer.Base._warn(this.is + ':', !fromPage ? 'fromPage' : 'toPage', 'is undefined!');
+        console.warn(this.is + ':', !fromPage ? 'fromPage' : 'toPage', 'is undefined!');
         return null;
       };
 
       if (!fromPage.sharedElements || !toPage.sharedElements) {
-        Polymer.Base._warn(this.is + ':', 'sharedElements are undefined for', !fromPage.sharedElements ? fromPage : toPage);
+        console.warn(this.is + ':', 'sharedElements are undefined for', !fromPage.sharedElements ? fromPage : toPage);
         return null;
       };
 
       var from = fromPage.sharedElements[config.id]
       var to = toPage.sharedElements[config.id];
 
       if (!from || !to) {
-        Polymer.Base._warn(this.is + ':', 'sharedElement with id', config.id, 'not found in', !from ? fromPage : toPage);
+        console.warn(this.is + ':', 'sharedElement with id', config.id, 'not found in', !from ? fromPage : toPage);
         return null;
       }
 
       this.sharedElements = {
         from: from,
         to: to
       };
       return this.sharedElements;
     }
 
   };
 
   /** @polymerBehavior Polymer.NeonSharedElementAnimationBehavior */
   Polymer.NeonSharedElementAnimationBehavior = [
     Polymer.NeonAnimationBehavior,
     Polymer.NeonSharedElementAnimationBehaviorImpl
   ];
 
 </script>