Allow assertions to be enabled in Blink Release builds.

Source/core/html/parser/HTMLToken.h

Index: Source/core/html/parser/HTMLToken.h
diff --git a/Source/core/html/parser/HTMLToken.h b/Source/core/html/parser/HTMLToken.h
index c6dee0d7244de075ce2019ed0ee921eb99ae5001..3132c9e76c53db3b22c56c159f0dc556383c39c8 100644
--- a/Source/core/html/parser/HTMLToken.h
+++ b/Source/core/html/parser/HTMLToken.h
@@ -291,7 +291,7 @@ public:
         ASSERT(m_type == StartTag || m_type == EndTag);
         m_attributes.grow(m_attributes.size() + 1);
         m_currentAttribute = &m_attributes.last();
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
         m_currentAttribute->nameRange.start = 0;
         m_currentAttribute->nameRange.end = 0;
         m_currentAttribute->valueRange.start = 0;
@@ -315,7 +315,7 @@ public:
     void beginAttributeValue(int offset)
     {
         m_currentAttribute->valueRange.start = offset - m_baseOffset;
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
         m_currentAttribute->valueRange.end = 0;
 #endif
     }