accidentally used <dom-module is=".."> in one test, which works in Chrome but not in FF (for unknown reason)

Author: Scott J Miles

test/unit/notify-path-elements.html

@@ -10,7 +10,7 @@
   });
 </script>
 
-<dom-module is="x-compose">
+<dom-module id="x-compose">
   <template>
     <x-basic id="basic1" notifying-value="{{obj.value}}" attrvalue$="{{obj.value}}" othervalue="{{obj.value2}}"></x-basic>
     <x-basic id="basic2" notifying-value="{{obj.value}}" attrvalue$="{{obj.value}}"></x-basic>
@@ -56,7 +56,7 @@
   </script>
 </dom-module>
 
-<dom-module is="x-forward">
+<dom-module id="x-forward">
   <template>
     <x-compose id="compose" obj="{{obj}}"></x-compose>
   </template>
@@ -101,7 +101,7 @@
   </script>
 </dom-module>
 
-<dom-module is="x-stuff">
+<dom-module id="x-stuff">
   <template>
     <x-basic id="basic" notifying-value="{{nested.obj.value}}" attrvalue$="{{nested.obj.value}}"></x-basic>
     <x-compose id="compose" obj="{{nested.obj}}"></x-compose>