Delete //sky/services/platform

sky/engine/web/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.
 
-visibility = [ "//sky/*" ]
-
 component("web") {
   output_name = "sky_web"
 
   deps = [
     "//sky/engine/core",
     "//sky/engine/platform",
   ]
 
   configs += [
     "//sky/engine:config",
     "//sky/engine:inside_blink",
     "//sky/engine:non_test_config",
   ]
 
   sources = [
     "Sky.cpp",
     "WebRuntimeFeatures.cpp",
   ]
 }