Do not transform scroll event ordinal values

ash/display/display_controller_unittest.cc

Index: ash/display/display_controller_unittest.cc
diff --git a/ash/display/display_controller_unittest.cc b/ash/display/display_controller_unittest.cc
index 287b0e4f455ba25a4448deff9c9330b6536eace8..c2e3e7d13c2e364ae35d52a31f806a04ebb3fd15 100644
--- a/ash/display/display_controller_unittest.cc
+++ b/ash/display/display_controller_unittest.cc
@@ -1148,11 +1148,11 @@ TEST_F(DisplayControllerTest, TouchScale) {
                            base::TimeDelta::FromMilliseconds(100),
                            10.0, 1.0, 5, 1);
 
-  // With device scale factor = 2, ordinal_offset * 2 = offset.
+  // ordinal_offset is invariant to the device scale factor.
   EXPECT_EQ(event_handler.scroll_x_offset(),
-            event_handler.scroll_x_offset_ordinal() * 2);
+            event_handler.scroll_x_offset_ordinal());
   EXPECT_EQ(event_handler.scroll_y_offset(),
-            event_handler.scroll_y_offset_ordinal() * 2);
+            event_handler.scroll_y_offset_ordinal());
 
   Shell::GetInstance()->RemovePreTargetHandler(&event_handler);
 }