Add 1.6x mode.

ui/display/test/display_manager_test_api.cc

Index: ui/display/test/display_manager_test_api.cc
diff --git a/ui/display/test/display_manager_test_api.cc b/ui/display/test/display_manager_test_api.cc
index 0a8078b4ebae0e780d0d40710f8036cfd62dc533..e57b1426462ef63109a4a573e7312e27ff012269 100644
--- a/ui/display/test/display_manager_test_api.cc
+++ b/ui/display/test/display_manager_test_api.cc
@@ -147,14 +147,6 @@ void DisplayManagerTestApi::SetTouchSupport(
       ->set_touch_support(touch_support);
 }
 
-ScopedDisable125DSFForUIScaling::ScopedDisable125DSFForUIScaling() {
-  ManagedDisplayInfo::SetUse125DSFForUIScalingForTest(false);
-}
-
-ScopedDisable125DSFForUIScaling::~ScopedDisable125DSFForUIScaling() {
-  ManagedDisplayInfo::SetUse125DSFForUIScalingForTest(true);
-}
-
 ScopedSetInternalDisplayId::ScopedSetInternalDisplayId(
     DisplayManager* display_manager,
     int64_t id) {