DevTools: [SSP] do not throw exception if click on yellow triangle

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

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * 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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 2262 matching lines @@
         if (this.parent.isShorthand)
             return;
 
         if (selectElement === this._expandElement)
             return;
 
         var section = this.section();
         if (section && !section.editable)
             return;
 
+        if (selectElement)
+            selectElement = selectElement.enclosingNodeOrSelfWithClass("webkit-css-property") || selectElement.enclosingNodeOrSelfWithClass("value");
         if (!selectElement)
-            selectElement = this.nameElement; // No arguments passed in - edit the name element by default.
-        else
-            selectElement = selectElement.enclosingNodeOrSelfWithClass("webkit-css-property") || selectElement.enclosingNodeOrSelfWithClass("value");
+            selectElement = this.nameElement;
 
         if (WebInspector.isBeingEdited(selectElement))
             return;
 
         var isEditingName = selectElement === this.nameElement;
         if (!isEditingName)
             this.valueElement.textContent = restoreURLs(this.valueElement.textContent, this.value);
 
         /**
          * @param {string} fieldValue
@@ skipping 812 matching lines @@
 
     /**
      * @override
      * @return {!WebInspector.ToolbarItem}
      */
     item: function()
     {
         return this._button;
     }
 }