remove unnecessary code

packages/app/src/client/services/AppContainer.js

@@ -167,28 +167,6 @@ export default class AppContainer extends Container {
     return this.componentInstances[id];
   }
 
-  /**
-   *
-   * @param {string} breakpoint id of breakpoint
-   * @param {function} handler event handler for media query
-   * @param {boolean} invokeOnInit invoke handler after the initialization if true
-   */
-  addBreakpointListener(breakpoint, handler, invokeOnInit = false) {
-    document.addEventListener('DOMContentLoaded', () => {
-      // get the value of '--breakpoint-*'
-      const breakpointPixel = parseInt(window.getComputedStyle(document.documentElement).getPropertyValue(`--breakpoint-${breakpoint}`), 10);
-
-      const mediaQuery = window.matchMedia(`(min-width: ${breakpointPixel}px)`);
-
-      // add event listener
-      mediaQuery.addListener(handler);
-      // initialize
-      if (invokeOnInit) {
-        handler(mediaQuery);
-      }
-    });
-  }
-
   getOriginRenderer() {
     return this.originRenderer;
   }