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

tracing/tracing/ui/extras/chrome/cc/layer_view.html

Index: tracing/tracing/ui/extras/chrome/cc/layer_view.html
diff --git a/tracing/tracing/ui/extras/chrome/cc/layer_view.html b/tracing/tracing/ui/extras/chrome/cc/layer_view.html
index b98bb5eecf911fc0e9e21872ce33fd4d1b7edae6..db978d6d3362f7a37f16822ad5bae976e58b010b 100644
--- a/tracing/tracing/ui/extras/chrome/cc/layer_view.html
+++ b/tracing/tracing/ui/extras/chrome/cc/layer_view.html
@@ -98,8 +98,9 @@ tr.exportTo('tr.ui.e.chrome.cc', function() {
         this.dragBar_.style.display = 'none';
         this.analysisEl_.style.display = 'none';
         var analysis = Polymer.dom(this.analysisEl_).firstChild;
-        if (analysis)
+        if (analysis) {
           Polymer.dom(this.analysisEl_).removeChild(analysis);
+        }
         this.layerTreeQuadStackView_.style.height =
             window.getComputedStyle(this).height;
       }
@@ -107,8 +108,9 @@ tr.exportTo('tr.ui.e.chrome.cc', function() {
     },
 
     createPictureBtn_: function(pictures) {
-      if (!(pictures instanceof Array))
+      if (!(pictures instanceof Array)) {
         pictures = [pictures];
+      }
 
       var link = document.createElement('tr-ui-a-analysis-link');
       link.selection = function() {
@@ -125,8 +127,9 @@ tr.exportTo('tr.ui.e.chrome.cc', function() {
     },
 
     onRequestSelectionChangeFromAnalysisEl_: function(e) {
-      if (!(e.selection instanceof tr.ui.e.chrome.cc.Selection))
+      if (!(e.selection instanceof tr.ui.e.chrome.cc.Selection)) {
         return;
+      }
 
       e.stopPropagation();
       this.selection = e.selection;