Remove update propagation

src/content/components/frame-content.js

@@ -1,16 +1,3 @@
 import CommonComponent from './common';
 
-export default class FrameContent {
-
-  constructor(win, store) {
-    this.children = [new CommonComponent(win, store)];
-  }
-
-  update() {
-    this.children.forEach(c => c.update());
-  }
-
-  onMessage(message, sender) {
-    this.children.forEach(c => c.onMessage(message, sender));
-  }
-}
+export default CommonComponent;