linux: Fix build on Karmic

chrome/renderer/websharedworkerrepository_impl.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.  Use of this
 // source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
 #ifndef CHROME_RENDERER_WEB_SHARED_WORKER_REPOSITORY_IMPL_H_
 #define CHROME_RENDERER_WEB_SHARED_WORKER_REPOSITORY_IMPL_H_
 
 #include "webkit/api/public/WebSharedWorkerRepository.h"
 
-class WebKit::WebSharedWorker;
+namespace WebKit {
+  class WebSharedWorker;
+}
 
 class WebSharedWorkerRepositoryImpl : public WebKit::WebSharedWorkerRepository {
     virtual WebKit::WebSharedWorker* lookup(const WebKit::WebURL& url,
                                             const WebKit::WebString& name,
                                             DocumentID document);
 
     virtual void documentDetached(DocumentID document);
 
     virtual bool hasSharedWorkers(DocumentID document);
 };
 
 #endif  // CHROME_RENDERER_WEB_SHARED_WORKER_REPOSITORY_IMPL_H_