DevTools: Avoid private member access in non-profiler code

Source/devtools/front_end/ui/SidebarTreeElement.js

Index: Source/devtools/front_end/ui/SidebarTreeElement.js
diff --git a/Source/devtools/front_end/ui/SidebarTreeElement.js b/Source/devtools/front_end/ui/SidebarTreeElement.js
index 77d97ae09a1d8e1d7471809a9d783622dcc96108..34a126f9fc74bd79b443cc990e78acfa312bc27e 100644
--- a/Source/devtools/front_end/ui/SidebarTreeElement.js
+++ b/Source/devtools/front_end/ui/SidebarTreeElement.js
@@ -58,7 +58,7 @@ WebInspector.SidebarSectionTreeElement.prototype = {
 
     onattach: function()
     {
-        this._listItemNode.classList.add("sidebar-tree-section");
+        this.listItemElement.classList.add("sidebar-tree-section");
     },
 
     onreveal: function()
@@ -111,8 +111,8 @@ WebInspector.SidebarTreeElement.prototype = {
     set small(x)
     {
         this._small = x;
-        if (this._listItemNode)
-            this._listItemNode.classList.toggle("small", this._small);
+        if (this.listItemElement)
+            this.listItemElement.classList.toggle("small", this._small);
     },
 
     get mainTitle()
@@ -139,7 +139,7 @@ WebInspector.SidebarTreeElement.prototype = {
 
     set wait(x)
     {
-        this._listItemNode.classList.toggle("wait", x);
+        this.listItemElement.classList.toggle("wait", x);
     },
 
     refreshTitles: function()
@@ -169,26 +169,26 @@ WebInspector.SidebarTreeElement.prototype = {
 
     onattach: function()
     {
-        this._listItemNode.classList.add("sidebar-tree-item");
+        this.listItemElement.classList.add("sidebar-tree-item");
 
         if (this.className)
-            this._listItemNode.classList.add(this.className);
+            this.listItemElement.classList.add(this.className);
 
         if (this.small)
-            this._listItemNode.classList.add("small");
+            this.listItemElement.classList.add("small");
 
         if (this.hasChildren && this.disclosureButton)
-            this._listItemNode.appendChild(this.disclosureButton);
+            this.listItemElement.appendChild(this.disclosureButton);
 
-        this._listItemNode.appendChild(this.iconElement);
-        this._listItemNode.appendChild(this.statusElement);
-        this._listItemNode.appendChild(this.titlesElement);
+        this.listItemElement.appendChild(this.iconElement);
+        this.listItemElement.appendChild(this.statusElement);
+        this.listItemElement.appendChild(this.titlesElement);
     },
 
     onreveal: function()
     {
-        if (this._listItemNode)
-            this._listItemNode.scrollIntoViewIfNeeded(false);
+        if (this.listItemElement)
+            this.listItemElement.scrollIntoViewIfNeeded(false);
     },
 
     __proto__: TreeElement.prototype