Add missing semicolon after variable assignment

fn assignment should end with a semicolon.

Author: zhaoz

src/lib/render-status.html

@@ -66,7 +66,7 @@
         this._waitingNextRender = true;
         var fn = function() {
           Polymer.RenderStatus._flushNextRender();
-        }
+        };
         if (!this._ready) {
           this.whenReady(fn);
         } else {