Replace or exclude MMX intrinsics in yuv_convert_simd_x86 due to lack of VS2010 support for them in…

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
new file mode 100644
index 0000000000000000000000000000000000000000..9bbe34c5524263bf2130bed088a2b3ccdbd2180d
--- /dev/null
+++ b/media/base/simd/empty_register_state_mmx.asm
@@ -0,0 +1,22 @@
+; 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 "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
+  global    mangle(SYMBOL) PRIVATE
+  align     function_align
+
+mangle(SYMBOL):
+  emms
+  ret