Rename PageLifecycleObserver to PageVisibilityObserver

third_party/WebKit/Source/modules/wake_lock/ScreenWakeLock.cpp

 // Copyright 2015 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 "modules/wake_lock/ScreenWakeLock.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Screen.h"
 #include "core/page/PageVisibilityState.h"
@@ skipping 45 matching lines @@
 }
 
 void ScreenWakeLock::contextDestroyed()
 {
     setKeepAwake(false);
 }
 
 DEFINE_TRACE(ScreenWakeLock)
 {
     Supplement<LocalFrame>::trace(visitor);
-    PageLifecycleObserver::trace(visitor);
+    PageVisibilityObserver::trace(visitor);
     ContextLifecycleObserver::trace(visitor);
 }
 
 ScreenWakeLock::ScreenWakeLock(LocalFrame& frame)
     : ContextLifecycleObserver(frame.document())
-    , PageLifecycleObserver(frame.page())
+    , PageVisibilityObserver(frame.page())
     , m_keepAwake(false)
 {
     DCHECK(!m_service.is_bound());
     DCHECK(frame.serviceRegistry());
     frame.serviceRegistry()->connectToRemoteService(mojo::GetProxy(&m_service));
 }
 
 bool ScreenWakeLock::keepAwake() const
 {
     return m_keepAwake;
@@ skipping 16 matching lines @@
     if (!m_service)
         return;
 
     if (m_keepAwake && page() && page()->isPageVisible())
         m_service->RequestWakeLock();
     else
         m_service->CancelWakeLock();
 }
 
 } // namespace blink