[ServiceWorker] Cleanup to remove old focus() code kept to not break Chromium.

Source/web/ServiceWorkerGlobalScopeClientImpl.cpp

 /*
  * Copyright (C) 2014 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 105 matching lines @@
 void ServiceWorkerGlobalScopeClientImpl::skipWaiting(WebServiceWorkerSkipWaitingCallbacks* callbacks)
 {
     m_client.skipWaiting(callbacks);
 }
 
 void ServiceWorkerGlobalScopeClientImpl::claim(WebServiceWorkerClientsClaimCallbacks* callbacks)
 {
     m_client.claim(callbacks);
 }
 
-void ServiceWorkerGlobalScopeClientImpl::focus(int clientID, WebServiceWorkerClientFocusCallback* callback)
-{
-    m_client.focus(clientID, callback);
-}
-
 void ServiceWorkerGlobalScopeClientImpl::focus(int clientID, WebServiceWorkerClientCallbacks* callback)
 {
     m_client.focus(clientID, callback);
 }
 
 ServiceWorkerGlobalScopeClientImpl::ServiceWorkerGlobalScopeClientImpl(WebServiceWorkerContextClient& client)
     : m_client(client)
 {
 }
 
 } // namespace blink