a11y role cleanup

src/vs/base/browser/ui/messagelist/messageList.ts

@@ -255,7 +255,6 @@ export class MessageList {
 				let messageContentElement: HTMLElement = <any>htmlRenderer.renderHtml({
 					tagName: 'span',
 					className: 'message-left-side',
-					role: 'alert',
 					formattedText: text
 				});
 

src/vs/workbench/browser/parts/activitybar/activityAction.ts

@@ -80,7 +80,7 @@ export class ActivityActionItem extends BaseActionItem {
 		}
 
 		this.$badge = this.builder.div({ 'class': 'badge' }, (badge: Builder) => {
-			this.$badgeContent = badge.div({ 'class': 'badge-content', 'role': 'presentation' });
+			this.$badgeContent = badge.div({ 'class': 'badge-content' });
 		});
 
 		this.$badge.hide();

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

@@ -303,9 +303,7 @@ export class EditorPart extends Part implements IEditorPart {
 				// Build Container off-DOM
 				editorContainer = $().div({
 					'class': 'editor-container',
-					id: editorDescriptor.getId(),
-					'role': 'presentation',
-					'aria-label': nls.localize('editorAccessibleLabel', "Editor Container")
+					id: editorDescriptor.getId()
 				}, (div) => {
 					newlyCreatedEditorContainerBuilder = div;
 				});