[DevTools] Inject element into toolbox window, do not load modules there.

Source/devtools/front_end/toolbox/ToolboxDelegate.js

Index: Source/devtools/front_end/toolbox/ToolboxDelegate.js
diff --git a/Source/devtools/front_end/toolbox/ToolboxDelegate.js b/Source/devtools/front_end/toolbox/ToolboxDelegate.js
index ae5941c433b3cbc98f7a6c73b391eaa5f6827914..0e0ddb6966c9d6461c018d06a472fc5636351d19 100644
--- a/Source/devtools/front_end/toolbox/ToolboxDelegate.js
+++ b/Source/devtools/front_end/toolbox/ToolboxDelegate.js
@@ -9,8 +9,12 @@ WebInspector.ToolboxDelegate = function() {}
 
 WebInspector.ToolboxDelegate.prototype = {
     /**
-     * @param {!WebInspector.ResponsiveDesignView} responsiveDesignView
-     * @param {!WebInspector.InspectedPagePlaceholder} placeholder
+     * @param {!Element} rootElement
      */
-    toolboxLoaded: function(responsiveDesignView, placeholder) {}
+    toolboxLoaded: function(rootElement) {},
+
+    /**
+     * @return {!InspectorFrontendHostAPI}
+     */
+    inspectorFrontendHost: function() {}
 }