Unify display ids between Display and PlatformDisplay.

services/ui/ws/touch_controller.cc

Index: services/ui/ws/touch_controller.cc
diff --git a/services/ui/ws/touch_controller.cc b/services/ui/ws/touch_controller.cc
index bb5a39a8d978b5fd26ff74ca4f7154565a649f9c..7c20847c3fdddc801152fa38554a0a8f04e4be05 100644
--- a/services/ui/ws/touch_controller.cc
+++ b/services/ui/ws/touch_controller.cc
@@ -82,7 +82,7 @@ void TouchController::UpdateTouchTransforms() const {
     const Display* touch_display = *touch_displays.begin();
     const ui::TouchscreenDevice& touch_device = touch_devices[0];
 
-    int64_t touch_display_id = touch_display->GetPlatformDisplayId();
+    int64_t touch_display_id = touch_display->id();
     int touch_device_id = touch_device.id;
 
     if (touch_device_id != ui::InputDevice::kInvalidId) {