Fix scrollbar in ie11 (#21976) (#22021)

* fix scrollbar in ie11

src/ui/public/styles/bootstrap/responsive-utilities.less

@@ -2,27 +2,6 @@
 // Responsive: Utility classes
 // --------------------------------------------------
 
-
-// IE10 in Windows (Phone) 8
-//
-// Support for responsive views via media queries is kind of borked in IE10, for
-// Surface/desktop in split view and for Windows Phone 8. This particular fix
-// must be accompanied by a snippet of JavaScript to sniff the user agent and
-// apply some conditional CSS to *only* the Surface/desktop Windows 8. Look at
-// our Getting Started page for more information on this bug.
-//
-// For more information, see the following:
-//
-// Issue: https://github.com/twbs/bootstrap/issues/10497
-// Docs: http://getbootstrap.com/getting-started/#support-ie10-width
-// Source: http://timkadlec.com/2013/01/windows-phone-8-and-device-width/
-// Source: http://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/
-
-@-ms-viewport {
-  width: device-width;
-}
-
-
 // Visibility utilities
 // Note: Deprecated .visible-xs, .visible-sm, .visible-md, and .visible-lg as of v3.2.0
 .visible-xs,