Start removing the double-negative !ASSERT_DISABLED

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 73 matching lines @@
 
 namespace WebCore {
 
 const int DragController::DragIconRightInset = 7;
 const int DragController::DragIconBottomInset = 3;
 
 static const int MaxOriginalImageArea = 1500 * 1500;
 static const int LinkDragBorderInset = 2;
 static const float DragImageAlpha = 0.75f;
 
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
 static bool dragTypeIsValid(DragSourceAction action)
 {
     switch (action) {
     case DragSourceActionDHTML:
     case DragSourceActionImage:
     case DragSourceActionLink:
     case DragSourceActionSelection:
         return true;
     case DragSourceActionNone:
         return false;
@@ skipping 860 matching lines @@
 
 void DragController::trace(Visitor* visitor)
 {
     visitor->trace(m_page);
     visitor->trace(m_documentUnderMouse);
     visitor->trace(m_dragInitiator);
     visitor->trace(m_fileInputElementUnderMouse);
 }
 
 } // namespace WebCore