npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.4.0/bower_components/core-ajax/core-xhr.html

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 <!--
 /**
@@ skipping 95 matching lines @@
             xhr.setRequestHeader(name, headers[name]);
           }
         }
       }
 
     });
 
   </script>
   
 </polymer-element>