Allow assertions to be enabled in Blink Release builds.

Source/core/rendering/FloatingObjects.h

Index: Source/core/rendering/FloatingObjects.h
diff --git a/Source/core/rendering/FloatingObjects.h b/Source/core/rendering/FloatingObjects.h
index f70622496396974ce4642b6aef000fea228d03dc..f53139ba5ac03719db67bc9f59623bac406f34df 100644
--- a/Source/core/rendering/FloatingObjects.h
+++ b/Source/core/rendering/FloatingObjects.h
@@ -79,7 +79,7 @@ public:
     int paginationStrut() const { return m_paginationStrut; }
     void setPaginationStrut(int strut) { m_paginationStrut = strut; }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     bool isInPlacedTree() const { return m_isInPlacedTree; }
     void setIsInPlacedTree(bool value) { m_isInPlacedTree = value; }
 #endif
@@ -106,7 +106,7 @@ private:
     unsigned m_shouldPaint : 1;
     unsigned m_isDescendant : 1;
     unsigned m_isPlaced : 1;
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     unsigned m_isInPlacedTree : 1;
 #endif
 };