Port SkXfermode opts to SkOpts.h

src/opts/SkXfermode_opts_none.cpp

Index: src/opts/SkXfermode_opts_none.cpp
diff --git a/src/opts/SkXfermode_opts_none.cpp b/src/opts/SkXfermode_opts_none.cpp
deleted file mode 100644
index 832d92eccd52fc6bd2d22d0d4922d03372a9b9eb..0000000000000000000000000000000000000000
--- a/src/opts/SkXfermode_opts_none.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * 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 "SkXfermode.h"
-#include "SkXfermode_proccoeff.h"
-
-
-SkProcCoeffXfermode* SkPlatformXfermodeFactory(const ProcCoeff& rec, SkXfermode::Mode mode);
-SkProcCoeffXfermode* SkPlatformXfermodeFactory(const ProcCoeff& rec, SkXfermode::Mode mode) {
-    return NULL;
-}
-
-SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode);
-SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode) {
-    return NULL;
-}