Use crappy apple define instead of OS_ defines since those don't exist for Sk...

skia/ext/convolver.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKIA_EXT_CONVOLVER_H_
 #define SKIA_EXT_CONVOLVER_H_
 
 #include <vector>
 
 // avoid confusion with Mac OS X's math library (Carbon)
-#if defined(OS_MACOSX)
+#if defined(__APPLE__)
 #undef FloatToFixed
 #endif
 
 namespace skia {
 
 // Represents a filter in one dimension. Each output pixel has one entry in this
 // object for the filter values contributing to it. You build up the filter
 // list by calling AddFilter for each output pixel (in order).
 //
 // We do 2-dimensional convolusion by first convolving each row by one
@@ skipping 104 matching lines @@
                     int source_byte_row_stride,
                     bool source_has_alpha,
                     const ConvolusionFilter1D& xfilter,
                     const ConvolusionFilter1D& yfilter,
                     unsigned char* output);
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_CONVOLVER_H_