Delete media/base/yuv_convert and dependents. Prefer libyuv.

media/base/simd/empty_register_state_mmx.asm

Index: media/base/simd/empty_register_state_mmx.asm
diff --git a/media/base/simd/empty_register_state_mmx.asm b/media/base/simd/empty_register_state_mmx.asm
deleted file mode 100644
index d0028b51f1b9f7208f3057b4fe96249b6f7cb77d..0000000000000000000000000000000000000000
--- a/media/base/simd/empty_register_state_mmx.asm
+++ /dev/null
@@ -1,24 +0,0 @@
-; Copyright (c) 2013 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 "media/base/simd/media_export.asm"
-%include "third_party/x86inc/x86inc.asm"
-
-;
-; This file uses MMX instructions as an alternative to _mm_empty() which
-; is not supported in Visual Studio 2010 on x64.
-; TODO(wolenetz): Use MMX intrinsics when compiling win64 with Visual
-; Studio 2012? http://crbug.com/173450
-;
-  SECTION_TEXT
-  CPU       MMX
-
-%define SYMBOL EmptyRegisterState_MMX
-  EXPORT    SYMBOL
-  align     function_align
-
-mangle(SYMBOL):
-  emms
-  ret
-