Allow assertions to be enabled in Blink Release builds.

Source/core/rendering/RenderLayerStackingNode.cpp

Index: Source/core/rendering/RenderLayerStackingNode.cpp
diff --git a/Source/core/rendering/RenderLayerStackingNode.cpp b/Source/core/rendering/RenderLayerStackingNode.cpp
index 3b64dad67ab9f140dfa0b2a86dd53b3fa14f435c..8ee81f12cf8bbbad6b90d5276352a8c8919d75e6 100644
--- a/Source/core/rendering/RenderLayerStackingNode.cpp
+++ b/Source/core/rendering/RenderLayerStackingNode.cpp
@@ -57,7 +57,7 @@ namespace WebCore {
 RenderLayerStackingNode::RenderLayerStackingNode(RenderLayer* layer)
     : m_layer(layer)
     , m_normalFlowListDirty(true)
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     , m_layerListMutationAllowed(true)
     , m_stackingParent(0)
 #endif
@@ -71,7 +71,7 @@ RenderLayerStackingNode::RenderLayerStackingNode(RenderLayer* layer)
 
 RenderLayerStackingNode::~RenderLayerStackingNode()
 {
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     if (!renderer()->documentBeingDestroyed()) {
         ASSERT(!isInStackingParentZOrderLists());
         ASSERT(!isInStackingParentNormalFlowList());
@@ -99,7 +99,7 @@ void RenderLayerStackingNode::dirtyZOrderLists()
     ASSERT(m_layerListMutationAllowed);
     ASSERT(isStackingContext());
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     updateStackingParentForZOrderLists(0);
 #endif
 
@@ -123,7 +123,7 @@ void RenderLayerStackingNode::dirtyNormalFlowList()
 {
     ASSERT(m_layerListMutationAllowed);
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     updateStackingParentForNormalFlowList(0);
 #endif
 
@@ -168,7 +168,7 @@ void RenderLayerStackingNode::rebuildZOrderLists()
         }
     }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     updateStackingParentForZOrderLists(this);
 #endif
 
@@ -190,7 +190,7 @@ void RenderLayerStackingNode::updateNormalFlowList()
         }
     }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     updateStackingParentForNormalFlowList(this);
 #endif
 
@@ -217,7 +217,7 @@ void RenderLayerStackingNode::collectLayers(OwnPtr<Vector<RenderLayerStackingNod
     }
 }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
 bool RenderLayerStackingNode::isInStackingParentZOrderLists() const
 {
     if (!m_stackingParent || m_stackingParent->zOrderListsDirty())