Remove mojo.SurfacesService interface in favor of mojo.Surface directly

services/surfaces/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("//mojo/public/mojo_application.gni")
 
 mojo_native_application("surfaces") {
   output_name = "surfaces_service"
   sources = [
     "surfaces_impl.cc",
     "surfaces_impl.h",
     "surfaces_scheduler.cc",
     "surfaces_scheduler.h",
     "surfaces_service_application.cc",
     "surfaces_service_application.h",
-    "surfaces_service_impl.cc",
-    "surfaces_service_impl.h",
   ]
 
   deps = [
     "//base",
     "//cc",
     "//cc/surfaces",
     "//ui/gfx/geometry",
     "//mojo/application",
     "//mojo/cc",
     "//mojo/common",
     "//mojo/common:tracing_impl",
     "//mojo/converters/geometry",
     "//mojo/converters/surfaces",
     "//mojo/environment:chromium",
     "//mojo/public/c/gles2",
     "//mojo/public/cpp/bindings",
     "//mojo/services/geometry/public/interfaces",
     "//mojo/services/gpu/public/interfaces",
     "//mojo/services/surfaces/public/interfaces",
   ]
 }