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

tracing/tracing/mre/job.html

Index: tracing/tracing/mre/job.html
diff --git a/tracing/tracing/mre/job.html b/tracing/tracing/mre/job.html
index c2a2761744ddfb9d6668e94604e5d219723dd8b6..b6d121bc842998367f00854d4bad37678e456e41 100644
--- a/tracing/tracing/mre/job.html
+++ b/tracing/tracing/mre/job.html
@@ -13,10 +13,11 @@ found in the LICENSE file.
 tr.exportTo('tr.mre', function() {
   function Job(mapFunctionHandle, opt_guid) {
     this.mapFunctionHandle_ = mapFunctionHandle;
-    if (opt_guid === undefined)
+    if (opt_guid === undefined) {
       this.guid_ = tr.b.GUID.allocateSimple();
-    else
+    } else {
       this.guid_ = opt_guid;
+    }
   }
 
   Job.prototype = {