Rename PageLifecycleObserver to PageVisibilityObserver

third_party/WebKit/Source/core/frame/PlatformEventController.cpp

 // Copyright 2014 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 "core/frame/PlatformEventController.h"
 
 #include "core/page/Page.h"
 
 namespace blink {
 
 PlatformEventController::PlatformEventController(Page* page)
-    : PageLifecycleObserver(page)
+    : PageVisibilityObserver(page)
     , m_hasEventListener(false)
     , m_isActive(false)
     , m_timer(this, &PlatformEventController::oneShotCallback)
 {
 }
 
 PlatformEventController::~PlatformEventController()
 {
 }
 
@@ skipping 37 matching lines @@
     if (!m_hasEventListener)
         return;
 
     if (page()->isPageVisible())
         startUpdating();
     else
         stopUpdating();
 }
 
 } // namespace blink