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"
 #include "SkValue.h"
 #include "SkValueKeys.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 {
@@ skipping 369 matching lines @@
 }
 
 #endif
 
 SkValue SkPixelXorXfermode::asValue() const {
     auto value = SkValue::Object(SkValue::PixelXorXfermode);
     value.set(SkValueKeys::PixelXorXfermode::kOpColor,
               SkValue::FromU32(SkToU32(fOpColor)));
     return value;
 }
+
+#endif