Remove obsolete comment

appinventor/appengine/src/com/google/appinventor/client/editor/simple/palette/ComponentHelpWidget.java

@@ -127,9 +127,7 @@ public void onClose(CloseEvent<PopupPanel> event) {
             lastClosureTime = System.currentTimeMillis();
           }
         });
-
-      // Use a Pinch Zoom aware PopupPanel.PositionCallback to handle positioning to
-      // avoid the Google Chrome Pinch Zoom bug.
+
       showRelativeTo(ComponentHelpWidget.this);
     }
   }