[DevTools] Fix 'node targets available' not appearing, but listed in Remote Devices drawer tab.

third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js

Index: third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js b/third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js
index e97e00e443b5c452a1d71767543637dadf672ec3..897bbbfe2424cbd228b0e8e514229b2f6bd568d4 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js
@@ -10,12 +10,12 @@ Sources.ThreadsSidebarPane = class extends UI.VBox {
     super(true);
     this.registerRequiredCSS('sources/threadsSidebarPane.css');
 
-    this._availableNodeTargetsElement = this.element.createChild('div', 'hidden available-node-targets');
-
     /** @type {!UI.ListControl<!SDK.DebuggerModel>} */
     this._list = new UI.ListControl(this, UI.ListMode.NonViewport);
     this.contentElement.appendChild(this._list.element);
 
+    this._availableNodeTargetsElement = this.contentElement.createChild('div', 'hidden available-node-targets');
+
     UI.context.addFlavorChangeListener(SDK.Target, this._targetFlavorChanged, this);
 
     SDK.targetManager.addModelListener(