stop using SkXfermode -- use SkBlendMode instead

ash/utility/screenshot_controller.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 "ash/utility/screenshot_controller.h"
 
 #include <cmath>
 
 #include "ash/display/mouse_cursor_event_filter.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ skipping 119 matching lines @@
     ui::PaintRecorder recorder(context, layer()->size());
 
     if (draw_inactive_overlay_) {
       recorder.canvas()->FillRect(gfx::Rect(layer()->size()),
                                   kSelectedAreaOverlayColor);
     }
 
     DrawPseudoCursor(recorder.canvas());
 
     if (!region_.IsEmpty())
-      recorder.canvas()->FillRect(region_, SK_ColorBLACK,
-                                  SkXfermode::kClear_Mode);
+      recorder.canvas()->FillRect(region_, SK_ColorBLACK, SkBlendMode::kClear);
   }
 
   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override {}
 
   void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
 
   // Mouse cursor may move sub DIP, so paint pseudo cursor instead of
   // using platform cursor so that it's aliend with the region.
   void DrawPseudoCursor(gfx::Canvas* canvas) {
     // Don't draw if window selection mode.
@@ skipping 394 matching lines @@
 
 void ScreenshotController::OnDisplayMetricsChanged(
     const display::Display& display,
     uint32_t changed_metrics) {}
 
 void ScreenshotController::OnWindowDestroying(aura::Window* window) {
   SetSelectedWindow(nullptr);
 }
 
 }  // namespace ash