Merge branch 'leipert-resolve-ee-diff' into 'master'

Port common class only used in EE

See merge request gitlab-org/gitlab-ce!31008

app/assets/stylesheets/framework/common.scss

@@ -434,6 +434,7 @@ img.emoji {
 
 /** COMMON SIZING CLASSES **/
 .w-0 { width: 0; }
+.w-8em { width: 8em; }
 
 .h-12em { height: 12em; }