Removed unused delay memeber from tree

src/vs/workbench/contrib/views/browser/treeView.ts

@@ -693,7 +693,6 @@ class TreeRenderer extends Disposable implements ITreeRenderer<ITreeItem, FuzzyS
 	static readonly TREE_TEMPLATE_ID = 'treeExplorer';
 
 	private _actionRunner: MultipleSelectionActionRunner | undefined;
-	private readonly hoverDelay: number;
 
 	constructor(
 		private treeViewId: string,
@@ -707,7 +706,6 @@ class TreeRenderer extends Disposable implements ITreeRenderer<ITreeItem, FuzzyS
 		@IHoverService private readonly hoverService: IHoverService
 	) {
 		super();
-		this.hoverDelay = 500; // milliseconds
 	}
 
 	get templateId(): string {