Hide SkPixelXorXfermode from Chrome

src/effects/SkPixelXorXfermode.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPixelXorXfermode.h"
+
+#if SK_INCLUDE_DEPRECATED_XFERMODES
+
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkString.h"
 
 // we always return an opaque color, 'cause I don't know what to do with
 // the alpha-component and still return a valid premultiplied color.
 SkPMColor SkPixelXorXfermode::xferColor(SkPMColor src, SkPMColor dst) const {
     SkPMColor res = src ^ dst ^ fOpColor;
 
@@ skipping 360 matching lines @@
 }
 
 bool SkPixelXorXfermode::asXPFactory(GrXPFactory** xpf) const {
     if (xpf) {
         *xpf = GrPixelXorXPFactory::Create(fOpColor);
     }
     return true;
 }
 
 #endif
+
+#endif