[core][mui-utils] Remove remaining IE11 references

packages/mui-utils/src/getDisplayName/getDisplayName.ts

@@ -18,7 +18,7 @@ function getWrappedName(outerType: any, innerType: any, wrapperName: string) {
 /**
  * cherry-pick from
  * https://github.com/facebook/react/blob/769b1f270e1251d9dbdce0fcbd9e92e502d059b8/packages/shared/getComponentName.js
- * originally forked from recompose/getDisplayName with added IE11 support
+ * originally forked from recompose/getDisplayName
  */
 export default function getDisplayName(Component: React.ElementType): string | undefined {
   if (Component == null) {

packages/mui-utils/src/index.ts

@@ -29,10 +29,6 @@ export { default as unstable_useTimeout, Timeout as unstable_Timeout } from './u
 export { default as unstable_useOnMount } from './useOnMount';
 export { default as unstable_useIsFocusVisible } from './useIsFocusVisible';
 export { default as unstable_getScrollbarSize } from './getScrollbarSize';
-export {
-  detectScrollType as unstable_detectScrollType,
-  getNormalizedScrollLeft as unstable_getNormalizedScrollLeft,
-} from './scrollLeft';
 export { default as usePreviousProps } from './usePreviousProps';
 export { default as getValidReactChildren } from './getValidReactChildren';
 export { default as visuallyHidden } from './visuallyHidden';