Remove unused `FRAME_CONNECTED` event

src/sidebar/events.js

@@ -3,9 +3,6 @@
  * on $rootScope
  */
 export default {
-  // Internal state changes
-  FRAME_CONNECTED: 'frameConnected',
-
   // Session state changes
 
   /** The logged-in user changed */

src/sidebar/services/frame-sync.js

@@ -203,7 +203,6 @@ export default function FrameSync($rootScope, $window, store, bridge) {
         return;
       }
 
-      $rootScope.$broadcast(events.FRAME_CONNECTED);
       store.connectFrame({
         id: info.frameIdentifier,
         metadata: info.metadata,