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

tracing/tracing/extras/chrome/slice_title_fixer.html

Index: tracing/tracing/extras/chrome/slice_title_fixer.html
diff --git a/tracing/tracing/extras/chrome/slice_title_fixer.html b/tracing/tracing/extras/chrome/slice_title_fixer.html
index a8dd1ae95e5b062f76580aadf3dda6f15630290e..da5adf130a603dea2a37c7e11d87de76241af470 100644
--- a/tracing/tracing/extras/chrome/slice_title_fixer.html
+++ b/tracing/tracing/extras/chrome/slice_title_fixer.html
@@ -25,8 +25,9 @@ tr.exportTo('tr.e.chrome', function() {
  // we're doing here. If this function ever becomes too complex we may consider
  // using a similar pattern.
   SliceTitleFixer.fromEvent = function(event) {
-    if (event.args && event.args['src_func'])
+    if (event.args && event.args['src_func']) {
       return event.title + ' <- ' + event.args['src_func'];
+    }
     return event.title;
   };