Remove timeout from Dock change announcement

We can use the UI Binding callback to issue the A11Y announcement,
that way we know that the docking changed,
if we didn't change docking we will immediately issue the announcement
https://crsrc.org/c/chrome/browser/devtools/devtools_window.cc;l=1637

Bug: none
Change-Id: I91e64793c7260e9074afecd4127040bdcc3a81d9
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6897850
Auto-Submit: Nikolay Vitkov <nvitkov@chromium.org>
Reviewed-by: Ergün Erdoğmuş <ergunsh@chromium.org>
Commit-Queue: Ergün Erdoğmuş <ergunsh@chromium.org>

Author: Lightning00Blade

front_end/ui/legacy/DockController.ts

@@ -116,7 +116,6 @@ export class DockController extends Common.ObjectWrapper.ObjectWrapper<EventType
 
   private dockSideChanged(): void {
     this.setDockSide(this.currentDockStateSetting.get());
-    setTimeout(this.announceDockLocation.bind(this), 2000);
   }
 
   dockSide(): DockState|undefined {
@@ -169,6 +168,7 @@ export class DockController extends Common.ObjectWrapper.ObjectWrapper<EventType
 
   private setIsDockedResponse(eventData: ChangeEvent): void {
     this.dispatchEventToListeners(Events.AFTER_DOCK_SIDE_CHANGED, eventData);
+    this.announceDockLocation();
   }
 
   toggleDockSide(): void {