Fix linking problem on Windows with ENABLE_LEGACY_NOTIFICATIONS disabled

Source/modules/notifications/NotificationCenter.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2012 Apple 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.
@@ skipping 13 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
+#if ENABLE(LEGACY_NOTIFICATIONS)
+
 #include "modules/notifications/NotificationCenter.h"
 
 #include "core/dom/Document.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "modules/notifications/NotificationClient.h"
 #include "weborigin/SecurityOrigin.h"
 
 namespace WebCore {
 
 PassRefPtr<NotificationCenter> NotificationCenter::create(ScriptExecutionContext* context, NotificationClient* client)
@@ skipping 83 matching lines @@
 }
 
 void NotificationCenter::NotificationRequestCallback::timerFired(Timer<NotificationCenter::NotificationRequestCallback>*)
 {
     if (m_callback)
         m_callback->handleEvent();
     m_notificationCenter->requestTimedOut(this);
 }
 
 } // namespace WebCore
+
+#endif // ENABLE(LEGACY_NOTIFICATIONS)