Allow assertions to be enabled in Blink Release builds.

Source/core/css/CSSTokenizer-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 1112 matching lines @@
 int CSSTokenizer::realLex(void* yylvalWithoutType)
 {
     YYSTYPE* yylval = static_cast<YYSTYPE*>(yylvalWithoutType);
     // Write pointer for the next character.
     SrcCharacterType* result;
     CSSParserString resultString;
     bool hasEscape;
 
     // The input buffer is terminated by a \0 character, so
     // it is safe to read one character ahead of a known non-null.
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     // In debug we check with an ASSERT that the length is > 0 for string types.
     yylval->string.clear();
 #endif
 
 restartAfterComment:
     result = currentCharacter<SrcCharacterType>();
     setTokenStart(result);
     m_tokenStartLineNumber = m_lineNumber;
     m_token = *currentCharacter<SrcCharacterType>();
     ++currentCharacter<SrcCharacterType>();
@@ skipping 438 matching lines @@
     m_dataStart16[length - 1] = 0;
 
     m_is8BitSource = false;
     m_currentCharacter8 = 0;
     m_currentCharacter16 = m_dataStart16.get();
     setTokenStart<UChar>(m_currentCharacter16);
     m_lexFunc = &CSSTokenizer::realLex<UChar>;
 }
 
 } // namespace WebCore