Replace tests of ASSERT_ENABLED with ENABLE(ASSERT).

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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 216 matching lines @@
 
     void trace(Visitor*);
     void willBeDestroyed();
 
 protected:
     PageLifecycleNotifier& lifecycleNotifier();
 
 private:
     void initGroup();
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     void checkSubframeCountConsistency() const;
 #else
     void checkSubframeCountConsistency() const { }
 #endif
 
     void setTimerAlignmentInterval(double);
 
     void setNeedsLayoutInAllFrames();
 
     // SettingsDelegate overrides.
@@ skipping 58 matching lines @@
     WillBeHeapHashSet<RawPtrWillBeWeakMember<MultisamplingChangedObserver> > m_multisamplingChangedObservers;
 
     // 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.
     OwnPtrWillBeMember<FrameHost> m_frameHost;
 };
 
 } // namespace WebCore
 
 #endif // Page_h