Move the "platform" wrappers in skia/ext to the skia namespace.

skia/ext/convolver_unittest.cc

 // 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.
 
 #include <string.h>
 #include <time.h>
 #include <vector>
 
 #include "skia/ext/convolver.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 105 matching lines @@
                     input[src_offset + src_row_stride] +  // Lower left.
                     input[src_offset + src_row_stride + 4];  // Lower right.
         value /= 4;  // Average.
         int difference = value - output[(y * dest_width + x) * 4 + channel];
         EXPECT_TRUE(difference >= -1 || difference <= 1);
       }
     }
   }
 }
 
-}  // namespace gfx
+}  // namespace skia