DevTools: move UI components to target observers in preparation to early UI initialization.

Source/devtools/front_end/elements/ElementsPanel.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 17 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 importScript("Spectrum.js");
 importScript("DOMSyntaxHighlighter.js");
 importScript("ElementsTreeOutline.js");
 importScript("EventListenersSidebarPane.js");
 importScript("MetricsSidebarPane.js");
 importScript("PlatformFontsSidebarPane.js");
 importScript("PropertiesSidebarPane.js");
-importScript("RenderingOptionsView.js");
 importScript("StylesSidebarPane.js");
 
 /**
  * @constructor
  * @implements {WebInspector.Searchable}
  * @implements {WebInspector.TargetManager.Observer}
  * @extends {WebInspector.Panel}
  */
 WebInspector.ElementsPanel = function()
 {
@@ skipping 1423 matching lines @@
         /**
          * @suppressReceiverCheck
          * @this {Element}
          */
         function parentElement()
         {
             return this.parentElement;
         }
     }
 }