Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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.
@@ skipping 117 matching lines @@
       m_useCounter(pageClients.chromeClient &&
                            pageClients.chromeClient->isSVGImageChromeClient()
                        ? UseCounter::SVGImageContext
                        : UseCounter::DefaultContext),
       m_openedByDOM(false),
       m_tabKeyCyclesThroughElements(true),
       m_suspended(false),
       m_deviceScaleFactor(1),
       m_visibilityState(PageVisibilityStateVisible),
       m_isCursorVisible(true),
-#if ENABLE(ASSERT)
-      m_isPainting(false),
-#endif
       m_frameHost(FrameHost::create(*this)) {
   ASSERT(m_editorClient);
 
   ASSERT(!allPages().contains(this));
   allPages().add(this);
 }
 
 Page::~Page() {
   // willBeDestroyed() must be called before Page destruction.
   ASSERT(!m_mainFrame);
@@ skipping 393 matching lines @@
     : chromeClient(nullptr),
       contextMenuClient(nullptr),
       editorClient(nullptr),
       spellCheckerClient(nullptr) {}
 
 Page::PageClients::~PageClients() {}
 
 template class CORE_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink