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

tracing/tracing/ui/analysis/single_object_instance_sub_view.html

Index: tracing/tracing/ui/analysis/single_object_instance_sub_view.html
diff --git a/tracing/tracing/ui/analysis/single_object_instance_sub_view.html b/tracing/tracing/ui/analysis/single_object_instance_sub_view.html
index c450bbcc9e99ffe2601972a10dbbb0c53951a742..696cf84782f81f05e7d450146489783c23a6016d 100644
--- a/tracing/tracing/ui/analysis/single_object_instance_sub_view.html
+++ b/tracing/tracing/ui/analysis/single_object_instance_sub_view.html
@@ -59,11 +59,13 @@ Polymer({
   },
 
   get requiresTallView() {
-    if (this.$.content.children.length === 0)
+    if (this.$.content.children.length === 0) {
       return false;
+    }
     if (this.$.content.children[0] instanceof
-        tr.ui.analysis.ObjectInstanceView)
+        tr.ui.analysis.ObjectInstanceView) {
       return this.$.content.children[0].requiresTallView;
+    }
   },
 
   get selection() {
@@ -72,8 +74,9 @@ Polymer({
 
   set selection(selection) {
     var instance = tr.b.getOnlyElement(selection);
-    if (!(instance instanceof tr.model.ObjectInstance))
+    if (!(instance instanceof tr.model.ObjectInstance)) {
       throw new Error('Only supports object instances');
+    }
 
     Polymer.dom(this.$.content).textContent = '';
     this.currentSelection_ = selection;