stop using SkXfermode -- use SkBlendMode instead

cc/output/overlay_unittest.cc

 // Copyright 2014 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 <stddef.h>
 
 #include <utility>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 673 matching lines @@
                                          &candidate_list, nullptr,
                                          &damage_rect_);
   EXPECT_EQ(0U, candidate_list.size());
 }
 
 TEST_F(SingleOverlayOnTopTest, RejectBlendMode) {
   std::unique_ptr<RenderPass> pass = CreateRenderPass();
   CreateFullscreenCandidateQuad(resource_provider_.get(),
                                 pass->shared_quad_state_list.back(),
                                 pass.get());
-  pass->shared_quad_state_list.back()->blend_mode = SkXfermode::kScreen_Mode;
+  pass->shared_quad_state_list.back()->blend_mode = SkBlendMode::kScreen;
 
   OverlayCandidateList candidate_list;
   overlay_processor_->ProcessForOverlays(resource_provider_.get(), pass.get(),
                                          &candidate_list, nullptr,
                                          &damage_rect_);
   EXPECT_EQ(0U, candidate_list.size());
 }
 
 TEST_F(SingleOverlayOnTopTest, RejectOpacity) {
   std::unique_ptr<RenderPass> pass = CreateRenderPass();
@@ skipping 1189 matching lines @@
                  gfx::Size(), filters_, gfx::Vector2dF(1, 1), gfx::PointF(),
                  background_filters_);
   }
 
   ProcessForOverlays();
   EXPECT_EQ(0U, ca_layer_list_.size());
 }
 
 }  // namespace
 }  // namespace cc