monaco-extension: finish TODO

code was merged upstream, so we no longer need the workaround

src/monaco-extension.d.ts

@@ -14,16 +14,6 @@ declare module 'react-monaco-editor' {
                 // https://github.com/microsoft/vscode/blob/d54c705f6567958a732ac88b1c3ec4d2303fb026/src/vs/editor/common/model.ts#L1148
                 canRedo: () => boolean;
             }
-
-            export interface ICodeEditor {
-                // null is allowed:
-                // https://github.com/microsoft/vscode/blob/b57db0fc49ee5777a4e02e8936f5b8cb9fb6182d/src/vs/editor/browser/widget/codeEditorWidget.ts#L995
-                // TODO: can be removed when https://github.com/microsoft/vscode/pull/146866 is merged
-                /**
-                 * Restores the view state of the editor from a serializable object generated by `saveViewState`.
-                 */
-                restoreViewState(state: ICodeEditorViewState | null): void;
-            }
         }
     }
 }