[DevTools] Fix compile errors before closure compiler roll

third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 1303 matching lines @@
     },
 
     /**
      * @param {!WebInspector.DOMNode} node
      * @return {!Array.<!WebInspector.DOMNode>} visibleChildren
      */
     _visibleChildren: function(node)
     {
         var visibleChildren = WebInspector.ElementsTreeElement.visibleShadowRoots(node);
 
-        if (node.importedDocument())
-            visibleChildren.push(node.importedDocument());
+        var importedDocument = node.importedDocument();
+        if (importedDocument)
+            visibleChildren.push(importedDocument);
 
-        if (node.templateContent())
-            visibleChildren.push(node.templateContent());
+        var templateContent = node.templateContent();
+        if (templateContent)
+            visibleChildren.push(templateContent);
 
         var beforePseudoElement = node.beforePseudoElement();
         if (beforePseudoElement)
             visibleChildren.push(beforePseudoElement);
 
         if (node.childNodeCount())
             visibleChildren = visibleChildren.concat(node.children());
 
         var afterPseudoElement = node.afterPseudoElement();
         if (afterPseudoElement)
@@ skipping 441 matching lines @@
             if (node) {
                 this.treeOutline._selectedDOMNode = node;
                 this.treeOutline._selectedNodeChanged();
             }
         }
         return true;
     },
 
     __proto__: TreeElement.prototype
 }