Remove duplicate CPU detection code; use base::CPU instead.

media/base/simd/convert_yuv_to_rgb_x86.cc

 // Copyright (c) 2011 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.
 
 #if defined(_MSC_VER)
 #include <intrin.h>
 #else
 #include <mmintrin.h>
 #endif
 
-#include "media/base/cpu_features.h"
 #include "media/base/simd/convert_yuv_to_rgb.h"
 #include "media/base/yuv_convert.h"
 
 namespace media {
 
 void ConvertYUVToRGB32_MMX(const uint8* yplane,
                            const uint8* uplane,
                            const uint8* vplane,
                            uint8* rgbframe,
                            int width,
@@ skipping 40 matching lines @@
                              u_ptr,
                              v_ptr,
                              rgb_row,
                              width);
   }
 
   _mm_empty();
 }
 
 }  // namespace media