Cleanup: Enable 125DSFForUIScaling on by default

ash/test/display_manager_test_api.h

 // 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.
 
 #ifndef ASH_TEST_DISPLAY_MANAGER_TEST_API_H_
 #define ASH_TEST_DISPLAY_MANAGER_TEST_API_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 48 matching lines @@
   void SetAvailableColorProfiles(
       int64 display_id,
       const std::vector<ui::ColorCalibrationProfile>& profiles);
 
  private:
   DisplayManager* display_manager_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManagerTestApi);
 };
 
+class ScopedDisable125DSFForUIScaling {
+ public:
+  ScopedDisable125DSFForUIScaling();
+  ~ScopedDisable125DSFForUIScaling();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ScopedDisable125DSFForUIScaling);
+};
+
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_DISPLAY_MANAGER_TEST_API_H_