Start removing the double-negative !ASSERT_DISABLED

Source/core/rendering/RenderBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 493 matching lines @@
     // Try to guess our correct logical top position. In most cases this guess will
     // be correct. Only if we're wrong (when we compute the real logical top position)
     // will we have to potentially relayout.
     LayoutUnit estimateWithoutPagination;
     LayoutUnit logicalTopEstimate = estimateLogicalTopPosition(child, marginInfo, estimateWithoutPagination);
 
     // Cache our old rect so that we can dirty the proper repaint rects if the child moves.
     LayoutRect oldRect = child->frameRect();
     LayoutUnit oldLogicalTop = logicalTopForChild(child);
 
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
     LayoutSize oldLayoutDelta = RuntimeEnabledFeatures::repaintAfterLayoutEnabled() ? LayoutSize() : view()->layoutDelta();
 #endif
     // Go ahead and position the child as though it didn't collapse with the top.
     setLogicalTopForChild(child, logicalTopEstimate, ApplyLayoutDelta);
 
     RenderBlock* childRenderBlock = child->isRenderBlock() ? toRenderBlock(child) : 0;
     RenderBlockFlow* childRenderBlockFlow = (childRenderBlock && child->isRenderBlockFlow()) ? toRenderBlockFlow(child) : 0;
     bool markDescendantsWithFloats = false;
     if (logicalTopEstimate != oldLogicalTop && !child->avoidsFloats() && childRenderBlock && childRenderBlock->containsFloats()) {
         markDescendantsWithFloats = true;
@@ skipping 1719 matching lines @@
                     // Special-case zero- and less-than-zero-height floats: those don't touch
                     // the line that they're on, but it still needs to be dirtied. This is
                     // accomplished by pretending they have a height of 1.
                     logicalBottom = max(logicalBottom, logicalTop + 1);
                 }
                 if (floatingObject->originatingLine()) {
                     if (!selfNeedsLayout()) {
                         ASSERT(floatingObject->originatingLine()->renderer() == this);
                         floatingObject->originatingLine()->markDirty();
                     }
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
                     floatingObject->setOriginatingLine(0);
 #endif
                 }
                 markLinesDirtyInBlockRange(0, logicalBottom);
             }
             m_floatingObjects->remove(floatingObject);
         }
     }
 }
 
@@ skipping 538 matching lines @@
 RenderBlockFlow::RenderBlockFlowRareData& RenderBlockFlow::ensureRareData()
 {
     if (m_rareData)
         return *m_rareData;
 
     m_rareData = adoptPtr(new RenderBlockFlowRareData(this));
     return *m_rareData;
 }
 
 } // namespace WebCore