Revert of Cleanup: Remove unneeded SSE2 checks and unused code.

media/base/simd/convert_yuv_to_rgb.h

Index: media/base/simd/convert_yuv_to_rgb.h
diff --git a/media/base/simd/convert_yuv_to_rgb.h b/media/base/simd/convert_yuv_to_rgb.h
index 54337bcd2cbb79b273cd45154819b18c73d6e86e..6c0a9661135e113533c78790318bc64d59229575 100644
--- a/media/base/simd/convert_yuv_to_rgb.h
+++ b/media/base/simd/convert_yuv_to_rgb.h
@@ -63,6 +63,17 @@
                                         int rgbstride,
                                         YUVType yuv_type);
 
+MEDIA_EXPORT void ConvertYUVToRGB32_MMX(const uint8* yplane,
+                                        const uint8* uplane,
+                                        const uint8* vplane,
+                                        uint8* rgbframe,
+                                        int width,
+                                        int height,
+                                        int ystride,
+                                        int uvstride,
+                                        int rgbstride,
+                                        YUVType yuv_type);
+
 MEDIA_EXPORT void ConvertYUVAToARGB_MMX(const uint8* yplane,
                                         const uint8* uplane,
                                         const uint8* vplane,
@@ -115,6 +126,13 @@
 // issue on at least Win64.  The C-equivalent RowProc versions' prototypes
 // include the same change to ptrdiff_t to reuse the typedefs.
 
+MEDIA_EXPORT void ConvertYUVToRGB32Row_MMX(const uint8* yplane,
+                                           const uint8* uplane,
+                                           const uint8* vplane,
+                                           uint8* rgbframe,
+                                           ptrdiff_t width,
+                                           const int16 convert_table[1024][4]);
+
 MEDIA_EXPORT void ConvertYUVAToARGBRow_MMX(const uint8* yplane,
                                            const uint8* uplane,
                                            const uint8* vplane,
@@ -130,6 +148,14 @@
                                            ptrdiff_t width,
                                            const int16 convert_table[1024][4]);
 
+MEDIA_EXPORT void ScaleYUVToRGB32Row_MMX(const uint8* y_buf,
+                                         const uint8* u_buf,
+                                         const uint8* v_buf,
+                                         uint8* rgb_buf,
+                                         ptrdiff_t width,
+                                         ptrdiff_t source_dx,
+                                         const int16 convert_table[1024][4]);
+
 MEDIA_EXPORT void ScaleYUVToRGB32Row_SSE(const uint8* y_buf,
                                          const uint8* u_buf,
                                          const uint8* v_buf,
@@ -147,6 +173,15 @@
     ptrdiff_t source_dx,
     const int16 convert_table[1024][4]);
 
+MEDIA_EXPORT void LinearScaleYUVToRGB32Row_MMX(
+    const uint8* y_buf,
+    const uint8* u_buf,
+    const uint8* v_buf,
+    uint8* rgb_buf,
+    ptrdiff_t width,
+    ptrdiff_t source_dx,
+    const int16 convert_table[1024][4]);
+
 MEDIA_EXPORT void LinearScaleYUVToRGB32Row_SSE(
     const uint8* y_buf,
     const uint8* u_buf,