remove unnecessary codes

src/client/js/services/NavigationContainer.js

@@ -111,16 +111,6 @@ export default class NavigationContainer extends Container {
   toggleDrawer() {
     const { isDrawerOpened } = this.state;
     this.setState({ isDrawerOpened: !isDrawerOpened });
-
-    // TODO: remove adding/removing classes after Reactify
-    const body = document.body;
-    const isOpenedInNewState = !isDrawerOpened;
-    if (isOpenedInNewState) {
-      body.classList.add('grw-drawer-opened');
-    }
-    else {
-      body.classList.remove('grw-drawer-opened');
-    }
   }
 
   /**