Revert of Update ozone/drm proxy_helpers.h to support move-only types.

ui/ozone/platform/drm/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("//ui/ozone/ozone.gni")
 
 visibility = [ "//ui/ozone/*" ]
 
 source_set("gbm") {
@@ skipping 144 matching lines @@
     "gpu/mock_drm_device.cc",
     "gpu/mock_drm_device.h",
     "gpu/mock_dumb_buffer_generator.cc",
     "gpu/mock_dumb_buffer_generator.h",
     "gpu/mock_hardware_display_plane_manager.cc",
     "gpu/mock_hardware_display_plane_manager.h",
     "gpu/mock_scanout_buffer.cc",
     "gpu/mock_scanout_buffer.h",
     "gpu/mock_scanout_buffer_generator.cc",
     "gpu/mock_scanout_buffer_generator.h",
-    "gpu/proxy_helpers_unittest.cc",
     "gpu/screen_manager_unittest.cc",
   ]
 
   deps = [
     ":gbm",
     "//skia",
     "//testing/gtest",
     "//third_party/libdrm",
     "//ui/gfx",
     "//ui/ozone:platform",
     "//ui/ozone/common",
   ]
 }