Allow assertions to be enabled in Blink Release builds.

Source/core/events/EventListenerMap.cpp

Index: Source/core/events/EventListenerMap.cpp
diff --git a/Source/core/events/EventListenerMap.cpp b/Source/core/events/EventListenerMap.cpp
index 901f06314acff1a6e15d17a66244d96a73f0b3df..437fbb9e42d696b3d963ab9c32de1b966856a574 100644
--- a/Source/core/events/EventListenerMap.cpp
+++ b/Source/core/events/EventListenerMap.cpp
@@ -37,7 +37,7 @@
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 #include "wtf/ThreadingPrimitives.h"
 #endif
 
@@ -45,7 +45,7 @@ using namespace WTF;
 
 namespace WebCore {
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 static Mutex& activeIteratorCountMutex()
 {
     DEFINE_STATIC_LOCAL(Mutex, mutex, ());
@@ -60,7 +60,7 @@ void EventListenerMap::assertNoActiveIterators()
 #endif
 
 EventListenerMap::EventListenerMap()
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     : m_activeIteratorCount(0)
 #endif
 {
@@ -236,7 +236,7 @@ EventListenerIterator::EventListenerIterator(EventTarget* target)
 
     m_map = &data->eventListenerMap;
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     {
         MutexLocker locker(activeIteratorCountMutex());
         m_map->m_activeIteratorCount++;
@@ -244,7 +244,7 @@ EventListenerIterator::EventListenerIterator(EventTarget* target)
 #endif
 }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 EventListenerIterator::~EventListenerIterator()
 {
     if (m_map) {