Merge branch 'revert-872f0550' into 'master'

Revert "Merge branch 'update-sassc' into 'master'"

See merge request gitlab-org/gitlab!27281

Gemfile.lock

@@ -973,8 +973,9 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sassc (2.2.1)
+    sassc (2.0.1)
       ffi (~> 1.9)
+      rake
     sassc-rails (2.1.0)
       railties (>= 4.0.0)
       sassc (>= 2.0)