Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, 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 632 matching lines @@
         m_contextEvictionManager->forciblyLoseOldestContext("WARNING: WebGL contexts have exceeded the maximum allowed backbuffer area. Oldest context will be lost.");
 
     if (adjustedSize != m_size) {
         do {
             // resize multisample FBO
             if (!resizeMultisampleFramebuffer(adjustedSize) || !resizeFramebuffer(adjustedSize)) {
                 adjustedSize.scale(s_resourceAdjustedRatio);
                 continue;
             }
 
-#if OS(DARWIN)
+#if OS(MACOSX)
             // FIXME: This can be removed once renderbufferStorageMultisample starts reporting GL_OUT_OF_MEMORY properly on OSX.
             if (!checkBufferIntegrity()) {
                 adjustedSize.scale(s_resourceAdjustedRatio);
                 continue;
             }
 #endif
             break;
         } while (!adjustedSize.isEmpty());
 
         setSize(adjustedSize);
@@ skipping 65 matching lines @@
 
 void DrawingBuffer::bind()
 {
     if (!m_context)
         return;
 
     m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO ? m_multisampleFBO : m_fbo);
 }
 
 } // namespace WebCore