Allow assertions to be enabled in Blink Release builds.

Source/platform/graphics/BitmapImage.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 381 matching lines @@
 {
     if (m_frames.size() <= index)
         return DefaultImageOrientation;
 
     if (m_frames[index].m_haveMetadata)
         return m_frames[index].m_orientation;
 
     return m_source.orientationAtIndex(index);
 }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
 bool BitmapImage::notSolidColor()
 {
     return size().width() != 1 || size().height() != 1 || frameCount() > 1;
 }
 #endif
 
 
 
 int BitmapImage::repetitionCount(bool imageKnownToBeComplete)
 {
@@ skipping 211 matching lines @@
     }
     return m_isSolidColor && !m_currentFrame;
 }
 
 Color BitmapImage::solidColor() const
 {
     return m_solidColor;
 }
 
 }