Make security sidebar collapsible

Bug: 377923493
Change-Id: I5b5ec028193de184d99803ce94a3a10810a81ceb
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6000803
Reviewed-by: Shuran Huang <[email protected]>
Reviewed-by: Kim-Anh Tran <[email protected]>
Commit-Queue: Joshua Thomas <[email protected]>

Author: masnoble

front_end/panels/security/SecurityPanelSidebar.ts

@@ -148,7 +148,6 @@ export class SecurityPanelSidebar extends UI.Widget.VBox {
   #createOriginGroupElement(originGroupTitle: string): UI.TreeOutline.TreeElement {
     const originGroup = new UI.TreeOutline.TreeElement(originGroupTitle, true);
     originGroup.selectable = false;
-    originGroup.setCollapsible(false);
     originGroup.expand();
     originGroup.listItemElement.classList.add('security-sidebar-origins');
     UI.ARIAUtils.setLabel(originGroup.childrenListElement, originGroupTitle);