Remove SkOpts_sse2.cpp.

src/opts/SkOpts_ssse3.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOpts.h"
+#define SK_OPTS_NS ssse3
+#include "SkBlitMask_opts.h"
+#include "SkXfermode_opts.h"
 
 namespace SkOpts {
     void Init_ssse3() {
-
+        create_xfermode = SkCreate4pxXfermode;
+        blit_mask_d32_a8 = ssse3::blit_mask_d32_a8;
     }
 }