npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.4.0/bower_components/core-overlay/core-overlay.html

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 <link rel="import" href="../polymer/polymer.html">
@@ skipping 738 matching lines @@
       }
     }
   }
 
   function getBackdrops() {
     return backdrops;
   }
 })();
 </script>
 </polymer-element>