Merge branch 'ee-10533-blank-css' into 'master'

EE: Removes EE differences for blank.scss

See merge request gitlab-org/gitlab-ee!10311

app/assets/stylesheets/framework/blank.scss

@@ -101,8 +101,6 @@
   }
 }
 
-/* EE-specific Styles */
-
 @include media-breakpoint-up(lg) {
   .column-large {
     flex: 2;