Merge branch 'ee-10520-builds-css' into 'master'

EE: Removes EE differences for builds.css

See merge request gitlab-org/gitlab-ee!10310

app/assets/stylesheets/pages/builds.scss

@@ -142,6 +142,12 @@
   }
 }
 
+.with-performance-bar .build-page {
+  .top-bar.affix {
+    top: $header-height + $performance-bar-height;
+  }
+}
+
 .build-header {
   .ci-header-container,
   .header-action-buttons {