DevTools: fix compilation after latest closure compiler roll.

Source/devtools/front_end/host/InspectorFrontendHost.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 417 matching lines @@
                 var value = proto[name];
                 if (typeof value !== "function" || InspectorFrontendHost[name])
                     continue;
 
                 InspectorFrontendHost[name] = stub.bind(null, name);
             }
         }
 
         /**
          * @param {string} name
+         * @return {?}
          */
         function stub(name)
         {
             console.error("Incompatible embedder: method InspectorFrontendHost." + name + " is missing. Using stub instead.");
             var args = Array.prototype.slice.call(arguments, 1);
             return proto[name].apply(InspectorFrontendHost, args);
         }
 
         // Attach the events object.
         InspectorFrontendHost.events = new WebInspector.Object();
@@ skipping 62 matching lines @@
     // so the host instance should not initialized there.
     initializeInspectorFrontendHost();
     window.InspectorFrontendAPI = new InspectorFrontendAPIImpl();
     WebInspector.setLocalizationPlatform(InspectorFrontendHost.platform());
 })();
 
 /**
  * @type {!WebInspector.EventTarget}
  */
 InspectorFrontendHost.events;