remove unused import

src/vs/vscode.proposed.d.ts

@@ -3,9 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-// This is the place for API experiments and proposal.
-
-import { QuickPickItem } from 'vscode';
+// This is the place for API experiments and proposals.
 
 declare module 'vscode' {