stop using SkXfermode -- use SkBlendMode instead

cc/quads/shared_quad_state.h

Index: cc/quads/shared_quad_state.h
diff --git a/cc/quads/shared_quad_state.h b/cc/quads/shared_quad_state.h
index 75f603fe6a6c24fb3ef4e440abc00ebf51a7c195..c1a3cc73536ea2e69adaa387ca680292a88ac66d 100644
--- a/cc/quads/shared_quad_state.h
+++ b/cc/quads/shared_quad_state.h
@@ -8,7 +8,7 @@
 #include <memory>
 
 #include "cc/base/cc_export.h"
-#include "third_party/skia/include/core/SkXfermode.h"
+#include "third_party/skia/include/core/SkBlendMode.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/transform.h"
 
@@ -38,7 +38,7 @@ class CC_EXPORT SharedQuadState {
               const gfx::Rect& clip_rect,
               bool is_clipped,
               float opacity,
-              SkXfermode::Mode blend_mode,
+              SkBlendMode blend_mode,
               int sorting_context_id);
   void AsValueInto(base::trace_event::TracedValue* dict) const;
 
@@ -53,7 +53,7 @@ class CC_EXPORT SharedQuadState {
   gfx::Rect clip_rect;
   bool is_clipped;
   float opacity;
-  SkXfermode::Mode blend_mode;
+  SkBlendMode blend_mode;
   int sorting_context_id;
 };