[DevTools] Move network throttling to network panel.

Source/devtools/front_end/ui/Toolbar.js

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 704 matching lines @@
 
     /**
      * @return {number}
      */
     size: function()
     {
         return this._selectElement.childElementCount;
     },
 
     /**
+     * @return {!Array.<!Element>}
+     */
+    options: function()
+    {
+        return Array.prototype.slice.call(this._selectElement.children, 0);
+    },
+
+    /**
      * @param {!Element} option
      */
     addOption: function(option)
     {
         this._selectElement.appendChild(option);
     },
 
     /**
      * @param {string} label
      * @param {string=} title
@@ skipping 284 matching lines @@
             for (var i = 0; i < items.length; ++i) {
                 var item = items[i];
                 if (item)
                     this.appendToolbarItem(item);
             }
         }
     },
 
     __proto__: WebInspector.Toolbar.prototype
 }