Remove CompressibleStringImpl::s_isPageBackground

third_party/WebKit/Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 337 matching lines @@
             if (frame->isLocalFrame())
                 toLocalFrame(frame)->document()->visitedLinkState().invalidateStyleForLink(linkHash);
         }
     }
 }
 
 void Page::setVisibilityState(PageVisibilityState visibilityState, bool isInitialState)
 {
     static const double waitingTimeBeforeCompressingString = 10;
 
-    CompressibleStringImpl::setPageBackground(visibilityState == PageVisibilityStateHidden);
     if (m_visibilityState == visibilityState)
         return;
     m_visibilityState = visibilityState;
 
     if (!isInitialState)
         notifyPageVisibilityChanged();
 
     if (!isInitialState && m_mainFrame && m_mainFrame->isLocalFrame())
         deprecatedLocalMainFrame()->didChangeVisibilityState();
 
@@ skipping 238 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;
 
 } // namespace blink