Uses color variables instead.

app/assets/stylesheets/pages/merge_requests.scss

@@ -208,19 +208,19 @@
   .disabled-profile {
     width: 40px;
     height: 40px;
-    background: #CCC;
+    background: $border-gray-dark;
     border-radius: 20px;
     display: inline-block;
     margin-right: 10px;
   }
 
   .disabled-comment {
-    background: #F3F3F3;
+    background: $gray-light;
     display: inline-block;
     vertical-align: top;
     height: 200px;
     border-radius: 4px;
-    border: 1px solid #CCC;
+    border: 1px solid $border-gray-normal;
     padding-top: 90px;
     text-align: center;
     right: 20px;