Use platform's device scale factor for cursor

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h"
 
 #include "ash/wm/window_state.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 1867 matching lines @@
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     DetachToBrowserTabDragControllerTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII("ash-host-window-bounds",
                                     "400x400,0+400-800x800*2");
   }
 
   float GetCursorDeviceScaleFactor() const {
     ash::test::CursorManagerTestApi cursor_test_api(
         ash::Shell::GetInstance()->cursor_manager());
-    return cursor_test_api.GetDisplay().device_scale_factor();
+    return cursor_test_api.GetCurrentCursor().device_scale_factor();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(
       DifferentDeviceScaleFactorDisplayTabDragControllerTest);
 };
 
 namespace {
 
 // The points where a tab is dragged in CursorDeviceScaleFactorStep.
@@ skipping 433 matching lines @@
                         DetachToDockedTabDragControllerTest,
                         ::testing::Values("mouse", "mouse docked"));
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTestTouch,
                         ::testing::Values("touch", "touch docked"));
 #else
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTest,
                         ::testing::Values("mouse"));
 #endif