[ESLint] Fix violations when enabling curly rule in eslint.

tracing/tracing/base/category_util.html

Index: tracing/tracing/base/category_util.html
diff --git a/tracing/tracing/base/category_util.html b/tracing/tracing/base/category_util.html
index 7287bbd3ed5a4b2014165a24d00955358d93a28d..8d17f4ea6b661c6127a38e48b2bc82b6bfd995f5 100644
--- a/tracing/tracing/base/category_util.html
+++ b/tracing/tracing/base/category_util.html
@@ -27,8 +27,7 @@ tr.exportTo('tr.b', function() {
    */
   function getCategoryParts(category) {
     var parts = categoryPartsFor[category];
-    if (parts !== undefined)
-      return parts;
+    if (parts !== undefined) return parts;
     parts = category.split(',');
     categoryPartsFor[category] = parts;
     return parts;