[ServiceWorker] Use WebPageVisibilityState in ClientInfo.

content/child/service_worker/service_worker_dispatcher.cc

 // Copyright 2013 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.
 
 #include "content/child/service_worker/service_worker_dispatcher.h"
 
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
 #include "base/stl_util.h"
 #include "base/threading/thread_local.h"
@@ skipping 663 matching lines @@
                                               int embedded_worker_id,
                                               int request_id,
                                               int provider_id) {
   blink::WebServiceWorkerClientInfo info;
   ScriptClientMap::iterator found = script_clients_.find(provider_id);
   // TODO(ksakamoto): Could we track these values in the browser side? Except
   // for |isFocused|, it would be pretty easy.
   if (found != script_clients_.end() && found->second->getClientInfo(&info)) {
     ServiceWorkerClientInfo result;
     result.client_id = info.clientID;
-    result.visibility_state = info.visibilityState.utf8();
+    result.page_visibility_state = info.pageVisibilityState;
     result.is_focused = info.isFocused;
     result.url = info.url;
     result.frame_type = static_cast<RequestContextFrameType>(info.frameType);
 
     thread_safe_sender_->Send(new ServiceWorkerHostMsg_GetClientInfoSuccess(
         embedded_worker_id, request_id, result));
   } else {
     thread_safe_sender_->Send(new ServiceWorkerHostMsg_GetClientInfoError(
         embedded_worker_id, request_id));
   }
@@ skipping 41 matching lines @@
         attrs.installing, thread_safe_sender_.get());
     ServiceWorkerHandleReference::Adopt(
         attrs.waiting, thread_safe_sender_.get());
     ServiceWorkerHandleReference::Adopt(
         attrs.active, thread_safe_sender_.get());
   }
   return registration;
 }
 
 }  // namespace content