open editors - remove unused method

src/vs/workbench/contrib/files/common/files.ts

@@ -18,7 +18,6 @@ import { ITextFileService } from 'vs/workbench/services/textfile/common/textfile
 import { InputFocusedContextKey } from 'vs/platform/contextkey/common/contextkeys';
 import { Registry } from 'vs/platform/registry/common/platform';
 import { IViewContainersRegistry, Extensions as ViewContainerExtensions, ViewContainer } from 'vs/workbench/common/views';
-import { Schemas } from 'vs/base/common/network';
 import { createDecorator } from 'vs/platform/instantiation/common/instantiation';
 import { IEditorGroup } from 'vs/workbench/services/editor/common/editorGroupsService';
 import { ExplorerItem } from 'vs/workbench/contrib/files/common/explorerModel';
@@ -256,10 +255,6 @@ export class OpenEditor implements IEditorIdentifier {
 		return this._group.previewEditor === this.editor;
 	}
 
-	isUntitled(): boolean {
-		return !!toResource(this.editor, { supportSideBySide: SideBySideEditor.MASTER, filterByScheme: Schemas.untitled });
-	}
-
 	isDirty(): boolean {
 		return this.editor.isDirty();
 	}