Reduce unused exports (microsoft#164935)

Author: chrmarti

src/vs/workbench/browser/parts/editor/editorStatus.ts

@@ -1322,7 +1322,7 @@ export class ChangeLanguageAction extends Action {
 	}
 }
 
-export interface IChangeEOLEntry extends IQuickPickItem {
+interface IChangeEOLEntry extends IQuickPickItem {
 	eol: EndOfLineSequence;
 }
 

src/vs/workbench/contrib/welcomeWalkthrough/browser/walkThroughInput.ts

@@ -16,7 +16,7 @@ import { Dimension } from 'vs/base/browser/dom';
 import { EditorInputCapabilities, IUntypedEditorInput } from 'vs/workbench/common/editor';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 
-export class WalkThroughModel extends EditorModel {
+class WalkThroughModel extends EditorModel {
 
 	constructor(
 		private mainRef: string,