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

tracing/tracing/ui/analysis/multi_user_expectation_sub_view.html

Index: tracing/tracing/ui/analysis/multi_user_expectation_sub_view.html
diff --git a/tracing/tracing/ui/analysis/multi_user_expectation_sub_view.html b/tracing/tracing/ui/analysis/multi_user_expectation_sub_view.html
index 0caf158532c20dc786f86dd7522bde254c8f7a2a..6dc1eeff25e24df52350e0f9067be35f92339588 100644
--- a/tracing/tracing/ui/analysis/multi_user_expectation_sub_view.html
+++ b/tracing/tracing/ui/analysis/multi_user_expectation_sub_view.html
@@ -47,10 +47,11 @@ Polymer({
     this.currentSelection_ = selection;
 
     this.$.relatedSamples.selection = selection;
-    if (this.$.relatedSamples.hasRelatedSamples())
+    if (this.$.relatedSamples.hasRelatedSamples()) {
       this.$.events.style.display = '';
-    else
+    } else {
       this.$.events.style.display = 'none';
+    }
   },
 
   get selection() {
@@ -58,8 +59,8 @@ Polymer({
   },
 
   get relatedEventsToHighlight() {
-    if (!this.currentSelection_)
-      return undefined;
+    if (!this.currentSelection_) return undefined;
+
     var selection = new tr.model.EventSet();
     this.currentSelection_.forEach(function(ir) {
       ir.associatedEvents.forEach(function(event) {