stop using SkXfermode -- use SkBlendMode instead

cc/output/ca_layer_overlay.cc

 // Copyright 2015 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.
 
 #include "cc/output/ca_layer_overlay.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/stream_video_draw_quad.h"
@@ skipping 151 matching lines @@
 }
 
 class CALayerOverlayProcessor {
  public:
   CALayerResult FromDrawQuad(ResourceProvider* resource_provider,
                              const gfx::RectF& display_rect,
                              const DrawQuad* quad,
                              CALayerOverlay* ca_layer_overlay,
                              bool* skip,
                              bool* render_pass_draw_quad) {
-    if (quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode)
+    if (quad->shared_quad_state->blend_mode != SkBlendMode::kSrcOver)
       return CA_LAYER_FAILED_QUAD_BLEND_MODE;
 
     // Early-out for invisible quads.
     if (quad->shared_quad_state->opacity == 0.f) {
       *skip = true;
       return CA_LAYER_SUCCESS;
     }
 
     // Enable edge anti-aliasing only on layer boundaries.
     ca_layer_overlay->edge_aa_mask = 0;
@@ skipping 129 matching lines @@
                             CA_LAYER_FAILED_COUNT);
 
   if (result != CA_LAYER_SUCCESS) {
     ca_layer_overlays->clear();
     return false;
   }
   return true;
 }
 
 }  // namespace cc