DevTools: Handle the F8 shortcut forwarded from the inspected page

Source/devtools/front_end/InspectorFrontendHostStub.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 200 matching lines @@
     },
 
     zoomOut: function()
     {
     },
 
     resetZoom: function()
     {
     },
 
+    setWhitelistedShortcuts: function(shortcuts)
+    {
+    },
+
     /**
      * @return {boolean}
      */
     isUnderTest: function()
     {
         return false;
     }
 }
 
 InspectorFrontendHost = new WebInspector.InspectorFrontendHostStub();
 
 }