Replace tests of ASSERT_ENABLED with ENABLE(ASSERT).

Source/wtf/LinkedHashSet.h

Index: Source/wtf/LinkedHashSet.h
diff --git a/Source/wtf/LinkedHashSet.h b/Source/wtf/LinkedHashSet.h
index 9faff169915d82777f6db74140da1b9f818ad0a3..19c4ff3a586c5a78d14331fa14ef0ef0b7282f3c 100644
--- a/Source/wtf/LinkedHashSet.h
+++ b/Source/wtf/LinkedHashSet.h
@@ -380,7 +380,7 @@ private:
 protected:
     LinkedHashSetConstIterator(const LinkedHashSetNodeBase* position, const LinkedHashSetType* container)
         : m_position(position)
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
         , m_container(container)
         , m_containerModifications(container->modifications())
 #endif
@@ -426,7 +426,7 @@ public:
 
 private:
     const LinkedHashSetNodeBase* m_position;
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     void checkModifications() const { m_container->checkModifications(m_containerModifications); }
     const LinkedHashSetType* m_container;
     int64_t m_containerModifications;