Cleanup: Remove unneeded SSE2 checks and unused code.

media/base/simd/convert_yuv_to_rgb_mmx.asm

Index: media/base/simd/convert_yuv_to_rgb_mmx.asm
diff --git a/media/base/simd/convert_yuv_to_rgb_mmx.asm b/media/base/simd/convert_yuv_to_rgb_mmx.asm
deleted file mode 100644
index 7395419d442ee6f74df6ce4d0c2ea9926f628a74..0000000000000000000000000000000000000000
--- a/media/base/simd/convert_yuv_to_rgb_mmx.asm
+++ /dev/null
@@ -1,23 +0,0 @@
-; 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.
-
-%include "third_party/x86inc/x86inc.asm"
-
-;
-; This file uses MMX instructions.
-;
-  SECTION_TEXT
-  CPU       MMX
-
-; Use movq to save the output.
-%define MOVQ movq
-
-; extern "C" void ConvertYUVToRGB32Row_MMX(const uint8* y_buf,
-;                                          const uint8* u_buf,
-;                                          const uint8* v_buf,
-;                                          uint8* rgb_buf,
-;                                          ptrdiff_t width,
-;                                          const int16 convert_table[1024][4]);
-%define SYMBOL ConvertYUVToRGB32Row_MMX
-%include "convert_yuv_to_rgb_mmx.inc"