Make DummyPageHolder to have all empty clients

Source/core/testing/DummyPageHolder.cpp

 /*
  * Copyright (c) 2013, 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 28 matching lines @@
 
 namespace WebCore {
 
 PassOwnPtr<DummyPageHolder> DummyPageHolder::create(const IntSize& initialViewSize)
 {
     return adoptPtr(new DummyPageHolder(initialViewSize));
 }
 
 DummyPageHolder::DummyPageHolder(const IntSize& initialViewSize)
 {
-    m_pageClients.chromeClient = &m_chromeClient;
-    m_pageClients.contextMenuClient = &m_contextMenuClient;
-    m_pageClients.editorClient = &m_editorClient;
-    m_pageClients.dragClient = &m_dragClient;
-    m_pageClients.inspectorClient = &m_inspectorClient;
-    m_pageClients.backForwardClient = &m_backForwardClient;
-
+    fillWithEmptyClients(m_pageClients);
     m_page = adoptPtrWillBeNoop(new Page(m_pageClients));
     Settings& settings = m_page->settings();
     // FIXME: http://crbug.com/363843. This needs to find a better way to
     // not create graphics layers.
     settings.setAcceleratedCompositingEnabled(false);
 
     m_frame = LocalFrame::create(&m_frameLoaderClient, &m_page->frameHost(), 0);
     m_frame->setView(FrameView::create(m_frame.get(), initialViewSize));
     m_frame->init();
 }
@@ skipping 22 matching lines @@
 {
     return *m_frame->view();
 }
 
 Document& DummyPageHolder::document() const
 {
     return *m_frame->domWindow()->document();
 }
 
 } // namespace WebCore