ozone: Use gfx::Display size for touch scaling

ui/gfx/ozone/surface_factory_ozone.cc

Index: ui/gfx/ozone/surface_factory_ozone.cc
diff --git a/ui/gfx/ozone/surface_factory_ozone.cc b/ui/gfx/ozone/surface_factory_ozone.cc
index 97e28bf241f0c309d7ba1c8f774fb1089c489f31..082ab4c9b4c753206fc28873c5452fe9ad7f28f1 100644
--- a/ui/gfx/ozone/surface_factory_ozone.cc
+++ b/ui/gfx/ozone/surface_factory_ozone.cc
@@ -29,13 +29,6 @@ void SurfaceFactoryOzone::SetInstance(SurfaceFactoryOzone* impl) {
   impl_ = impl;
 }
 
-const char* SurfaceFactoryOzone::DefaultDisplaySpec() {
-  char* envvar = getenv("ASH_DISPLAY_SPEC");
-  if (envvar)
-    return envvar;
-  return  "720x1280*2";
-}
-
 gfx::Screen* SurfaceFactoryOzone::CreateDesktopScreen() {
   return NULL;
 }