[WIP][Ozone] Support external touchscreens

ui/events/ozone/evdev/touch_event_converter_evdev.h

Index: ui/events/ozone/evdev/touch_event_converter_evdev.h
diff --git a/ui/events/ozone/evdev/touch_event_converter_evdev.h b/ui/events/ozone/evdev/touch_event_converter_evdev.h
index 83aa13ac1a8f819c684c2e96ed6f4c43b3eb620d..9f875a431752c1011d79a2a3f5d38757ed6adcaa 100644
--- a/ui/events/ozone/evdev/touch_event_converter_evdev.h
+++ b/ui/events/ozone/evdev/touch_event_converter_evdev.h
@@ -74,14 +74,6 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   float y_min_tuxels_;
   float y_num_tuxels_;
 
-  // Output range for x-axis.
-  float x_min_pixels_;
-  float x_num_pixels_;
-
-  // Output range for y-axis.
-  float y_min_pixels_;
-  float y_num_pixels_;
-
   // Size of the touchscreen as reported by the driver.
   gfx::Size native_size_;