Allow assertions to be enabled in Blink Release builds.

Source/bindings/core/v8/custom/V8BlobCustomHelpers.h

 /*
  * Copyright (C) 2013 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 58 matching lines @@
     bool parseBlobPropertyBag(v8::Local<v8::Value> propertyBag, const char* blobClassName, ExceptionState&, v8::Isolate*);
 
 private:
     String m_contentType;
     bool m_normalizeLineEndingsToNative;
 
     // False if this contains the properties of a BlobPropertyBag.
     bool m_hasFileProperties;
 
     double m_lastModified;
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     bool m_hasLastModified;
-#endif // NDEBUG
+#endif // ENABLE(ASSERT)
 };
 
 // Appends the blobParts passed to a Blob or File constructor into a BlobData.
 // http://www.w3.org/TR/FileAPI/#constructorParams
 // Returns true if everything went well, false if a JS exception was thrown.
 bool processBlobParts(v8::Local<v8::Object> blobParts, bool normalizeLineEndingsToNative, BlobData&, v8::Isolate*);
 
 } // namespace V8BlobCustomHelpers
 
 } // namespace WebCore
 
 #endif // V8BlobCustomHelpers_h