src/vs/workbench/api/common/extHostInteractive.ts/ExtHostInteractive/$willRemoveInteractiveDocument
class ExtHostInteractive:	$willRemoveInteractiveDocument(uri: UriComponents, notebookUri: UriComponents) {
		this._textDocumentsAndEditors.acceptDocumentsAndEditorsDelta({
			removedDocuments: [uri]
		});
	}