Remove all uses of skia::RefPtr and stale includes

cc/layers/draw_properties.h

 // Copyright 2012 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.
 
 #ifndef CC_LAYERS_DRAW_PROPERTIES_H_
 #define CC_LAYERS_DRAW_PROPERTIES_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "cc/trees/occlusion.h"
-#include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 class RenderSurfaceImpl;
 
 // Container for properties that layers need to compute before they can be
 // drawn.
 struct CC_EXPORT DrawProperties {
   DrawProperties();
@@ skipping 47 matching lines @@
   float maximum_animation_contents_scale;
 
   // The scale during the layer animation start at which content should be
   // rastered at to be crisp.
   float starting_animation_contents_scale;
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_DRAW_PROPERTIES_H_