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

tracing/tracing/ui/base/list_view.html

Index: tracing/tracing/ui/base/list_view.html
diff --git a/tracing/tracing/ui/base/list_view.html b/tracing/tracing/ui/base/list_view.html
index c7f927f32b34e97dc96f666ed4eb84371803bca5..0f69b3e01583b5ae4d3930613f16e3b89ee3d5a0 100644
--- a/tracing/tracing/ui/base/list_view.html
+++ b/tracing/tracing/ui/base/list_view.html
@@ -51,16 +51,19 @@ tr.exportTo('tr.ui.b', function() {
             configurable: true,
             set: function(value) {
               var oldSelection = listView.selectedElement;
-              if (oldSelection && oldSelection !== this && value)
+              if (oldSelection && oldSelection !== this && value) {
                 Polymer.dom(listView.selectedElement).removeAttribute(
                     'selected');
-              if (value)
+              }
+              if (value) {
                 Polymer.dom(this).setAttribute('selected', 'selected');
-              else
+              } else {
                 Polymer.dom(this).removeAttribute('selected');
+              }
               var newSelection = listView.selectedElement;
-              if (newSelection !== oldSelection)
+              if (newSelection !== oldSelection) {
                 tr.b.dispatchSimpleEvent(listView, 'selection-changed', false);
+              }
             },
             get: function() {
               return this.hasAttribute('selected');
@@ -81,27 +84,29 @@ tr.exportTo('tr.ui.b', function() {
     },
 
     doneDecoratingForNow_: function() {
-      if (this.selectionChanged_)
+      if (this.selectionChanged_) {
         tr.b.dispatchSimpleEvent(this, 'selection-changed', false);
+      }
     },
 
     get selectedElement() {
       var el = Polymer.dom(this).querySelector('.list-item[selected]');
-      if (!el)
-        return undefined;
+      if (!el) return undefined;
       return el;
     },
 
     set selectedElement(el) {
       if (!el) {
-        if (this.selectedElement)
+        if (this.selectedElement) {
           this.selectedElement.selected = false;
+        }
         return;
       }
 
-      if (el.parentElement !== this)
+      if (el.parentElement !== this) {
         throw new Error(
             'Can only select elements that are children of this list view');
+      }
       el.selected = true;
     },
 
@@ -113,25 +118,28 @@ tr.exportTo('tr.ui.b', function() {
     clear: function() {
       var changed = this.selectedElement !== undefined;
       tr.ui.b.ContainerThatDecoratesItsChildren.prototype.clear.call(this);
-      if (changed)
+      if (changed) {
         tr.b.dispatchSimpleEvent(this, 'selection-changed', false);
+      }
     },
 
     onItemClicked_: function(e) {
       var currentSelectedElement = this.selectedElement;
-      if (currentSelectedElement)
+      if (currentSelectedElement) {
         Polymer.dom(currentSelectedElement).removeAttribute('selected');
+      }
       var element = e.target;
-      while (element.parentElement !== this)
+      while (element.parentElement !== this) {
         element = element.parentElement;
-      if (element !== currentSelectedElement)
+      }
+      if (element !== currentSelectedElement) {
         Polymer.dom(element).setAttribute('selected', 'selected');
+      }
       tr.b.dispatchSimpleEvent(this, 'selection-changed', false);
     },
 
     onKeyDown_: function(e) {
-      if (this.selectedElement === undefined)
-        return;
+      if (this.selectedElement === undefined) return;
 
       if (e.keyCode === 38) { // Up arrow.
         var prev = Polymer.dom(this.selectedElement).previousSibling;