ozone: Remove the "drm" software composited platform

ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc

Index: ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc
diff --git a/ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc b/ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc
deleted file mode 100644
index 4b227295a2a0afb87562adfbcc584ba0075bb698..0000000000000000000000000000000000000000
--- a/ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 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.
-
-#include "ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.h"
-
-#include "ui/ozone/common/stub_client_native_pixmap_factory.h"
-
-namespace ui {
-
-ClientNativePixmapFactory* CreateClientNativePixmapFactoryDri() {
-  return CreateStubClientNativePixmapFactory();
-}
-
-ClientNativePixmapFactory* CreateClientNativePixmapFactoryDrm() {
-  return CreateStubClientNativePixmapFactory();
-}
-
-}  // namespace ui