Always use DirectCompositionSurfaceWin when using DirectComposition

gpu/ipc/service/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.
 
 import("//testing/test.gni")
 import("//build/config/ui.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
@@ skipping 62 matching lines @@
     "//base/third_party/dynamic_annotations",
     "//gpu/command_buffer/common:common_sources",
     "//gpu/command_buffer/service:service_sources",
     "//gpu/config:config_sources",
     "//gpu/config:crash_keys",
     "//gpu/ipc/common:ipc_common_sources",
   ]
   libs = []
   if (is_win) {
     sources += [
-      "child_window_surface_win.cc",
-      "child_window_surface_win.h",
       "child_window_win.cc",
       "child_window_win.h",
       "direct_composition_child_surface_win.cc",
       "direct_composition_child_surface_win.h",
       "direct_composition_surface_win.cc",
       "direct_composition_surface_win.h",
       "image_transport_surface_win.cc",
     ]
     libs += [ "dwmapi.lib" ]
   }
@@ skipping 86 matching lines @@
   if (is_mac) {
     sources += [ "gpu_memory_buffer_factory_io_surface_unittest.cc" ]
   }
   if (is_linux) {
     sources += [ "gpu_memory_buffer_factory_native_pixmap_unittest.cc" ]
   }
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
   }
 }