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

tracing/tracing/model/user_model/animation_expectation.html

Index: tracing/tracing/model/user_model/animation_expectation.html
diff --git a/tracing/tracing/model/user_model/animation_expectation.html b/tracing/tracing/model/user_model/animation_expectation.html
index 28b588be9a2f4a40b656bb4a69e94d83264a2349..a3fced6de2c31e853e19e9c5b69179ae683b33f7 100644
--- a/tracing/tracing/model/user_model/animation_expectation.html
+++ b/tracing/tracing/model/user_model/animation_expectation.html
@@ -23,14 +23,16 @@ tr.exportTo('tr.model.um', function() {
     constructor: AnimationExpectation,
 
     get frameEvents() {
-      if (this.frameEvents_)
+      if (this.frameEvents_) {
         return this.frameEvents_;
+      }
 
       this.frameEvents_ = new tr.model.EventSet();
 
       this.associatedEvents.forEach(function(event) {
-        if (event.title === tr.model.helpers.IMPL_RENDERING_STATS)
+        if (event.title === tr.model.helpers.IMPL_RENDERING_STATS) {
           this.frameEvents_.push(event);
+        }
       }, this);
 
       return this.frameEvents_;