[ServiceWorker] Use pageVisibilityState instead of visibilityState.

Source/modules/serviceworkers/ServiceWorkerContainer.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 273 matching lines @@
     return EventTargetNames::ServiceWorkerContainer;
 }
 
 bool ServiceWorkerContainer::getClientInfo(WebServiceWorkerClientInfo* info)
 {
     ExecutionContext* context = executionContext();
     // FIXME: Make this work for non-document context (e.g. shared workers).
     if (!context || !context->isDocument())
         return false;
     Document* document = toDocument(context);
-    // FIXME: remove info->visibilityState when Chromium is updated.
-    info->visibilityState = document->visibilityState();
     info->pageVisibilityState = static_cast<WebPageVisibilityState>(document->pageVisibilityState());
     info->isFocused = document->hasFocus();
     info->url = document->url();
     if (!document->frame())
         info->frameType = WebURLRequest::FrameTypeNone;
     else if (document->frame()->isMainFrame())
         info->frameType = WebURLRequest::FrameTypeTopLevel;
     else
         info->frameType = WebURLRequest::FrameTypeNested;
     return true;
@@ skipping 10 matching lines @@
     m_ready = createReadyProperty();
 
     if (ServiceWorkerContainerClient* client = ServiceWorkerContainerClient::from(executionContext)) {
         m_provider = client->provider();
         if (m_provider)
             m_provider->setClient(this);
     }
 }
 
 } // namespace blink