Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 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 195 matching lines @@
   static void allVisitedStateChanged(bool invalidateVisitedLinkHashes);
   static void visitedStateChanged(LinkHash visitedHash);
 
   void setVisibilityState(PageVisibilityState, bool);
   PageVisibilityState visibilityState() const;
   bool isPageVisible() const;
 
   bool isCursorVisible() const;
   void setIsCursorVisible(bool isVisible) { m_isCursorVisible = isVisible; }
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   void setIsPainting(bool painting) { m_isPainting = painting; }
   bool isPainting() const { return m_isPainting; }
 #endif
 
   void didCommitLoad(LocalFrame*);
 
   void acceptLanguagesChanged();
 
   static void networkStateChanged(bool online);
 
@@ skipping 61 matching lines @@
 
   bool m_tabKeyCyclesThroughElements;
   bool m_suspended;
 
   float m_deviceScaleFactor;
 
   PageVisibilityState m_visibilityState;
 
   bool m_isCursorVisible;
 
-#if ENABLE(ASSERT)
-  bool m_isPainting;
+#if DCHECK_IS_ON()
+  bool m_isPainting = false;
 #endif
 
   // A pointer to all the interfaces provided to in-process Frames for this
   // Page.
   // FIXME: Most of the members of Page should move onto FrameHost.
   Member<FrameHost> m_frameHost;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink
 
 #endif  // Page_h