Allow assertions to be enabled in Blink Release builds.

Source/core/dom/ChildFrameDisconnector.cpp

Index: Source/core/dom/ChildFrameDisconnector.cpp
diff --git a/Source/core/dom/ChildFrameDisconnector.cpp b/Source/core/dom/ChildFrameDisconnector.cpp
index 555da1cd3b97be61a677e619d6d134d32cbb3571..3882301fb6838cb87552449ff3d7dc95591aca23 100644
--- a/Source/core/dom/ChildFrameDisconnector.cpp
+++ b/Source/core/dom/ChildFrameDisconnector.cpp
@@ -12,13 +12,13 @@
 
 namespace WebCore {
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 static unsigned checkConnectedSubframeCountIsConsistent(Node&);
 #endif
 
 void ChildFrameDisconnector::disconnect(DisconnectPolicy policy)
 {
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     checkConnectedSubframeCountIsConsistent(m_root);
 #endif
 
@@ -72,7 +72,7 @@ void ChildFrameDisconnector::collectFrameOwners(ElementShadow& shadow)
         collectFrameOwners(*root);
 }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 static unsigned checkConnectedSubframeCountIsConsistent(Node& node)
 {
     unsigned count = 0;