Allow assertions to be enabled in Blink Release builds.

Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp

 /*
  * Copyright (C) 2007-2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
 
 namespace WebCore {
 
 // Check for a CSS prefix.
 // Passed prefix is all lowercase.
 // First character of the prefix within the property name may be upper or lowercase.
 // Other characters in the prefix within the property name must be lowercase.
 // The prefix within the property name must be followed by a capital letter.
 static bool hasCSSPropertyNamePrefix(const String& propertyName, const char* prefix)
 {
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     ASSERT(*prefix);
     for (const char* p = prefix; *p; ++p)
         ASSERT(isASCIILower(*p));
     ASSERT(propertyName.length());
 #endif
 
     if (toASCIILower(propertyName[0]) != prefix[0])
         return false;
 
     unsigned length = propertyName.length();
@@ skipping 150 matching lines @@
     ExceptionState exceptionState(ExceptionState::SetterContext, getPropertyName(static_cast<CSSPropertyID>(propInfo->propID)), "CSSStyleDeclaration", info.Holder(), info.GetIsolate());
     impl->setPropertyInternal(static_cast<CSSPropertyID>(propInfo->propID), propertyValue, false, exceptionState);
 
     if (exceptionState.throwIfNeeded())
         return;
 
     v8SetReturnValue(info, value);
 }
 
 } // namespace WebCore