Change mojo geometry structs from using type converters to StructTraits.

ui/mojo/display/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 component("display") {
   output_name = "mojo_display_lib"
 
   public_deps = [
     "//ui/display",
   ]
   deps = [
     "//components/mus/public/interfaces",
-    "//mojo/converters/geometry",
     "//mojo/public/c/system:for_component",
     "//ui/display",
   ]
 
   defines = [ "MOJO_DISPLAY_IMPLEMENTATION" ]
 
   sources = [
     "display_type_converters.cc",
     "display_type_converters.h",
     "mojo_display_export.h",
   ]
 }