Delete //sky/services/platform

sky/shell/BUILD.gn

 # 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.
 
 common_deps = [
   "//base",
   "//base:i18n",
   "//build/config/sanitizers:deps",
   "//dart/runtime:libdart",
   "//mojo/common",
   "//mojo/edk/system",
   "//mojo/public/cpp/application",
   "//mojo/public/interfaces/application",
   "//mojo/services/asset_bundle/public/interfaces",
   "//mojo/services/navigation/public/interfaces",
   "//mojo/services/network/public/interfaces",
   "//services/asset_bundle:lib",
   "//skia",
   "//sky/engine",
   "//sky/engine/tonic",
   "//sky/engine/wtf",
   "//sky/services/engine:interfaces",
-  "//sky/services/platform",
   "//sky/shell/dart",
   "//ui/gfx/geometry",
   "//ui/gl",
 ]
 
 source_set("common") {
   sources = [
     "gpu/ganesh_context.cc",
     "gpu/ganesh_context.h",
     "gpu/ganesh_surface.cc",
@@ skipping 15 matching lines @@
     "switches.cc",
     "switches.h",
     "ui/animator.cc",
     "ui/animator.h",
     "ui/engine.cc",
     "ui/engine.h",
     "ui/input_event_converter.cc",
     "ui/input_event_converter.h",
     "ui/internals.cc",
     "ui/internals.h",
+    "ui/platform_impl.cc",
+    "ui/platform_impl.h",
     "ui_delegate.cc",
     "ui_delegate.h",
   ]
 
   deps = common_deps
 }
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 123 matching lines @@
     ]
 
     deps = common_deps + [
              ":common",
              "//sky/services/testing:interfaces",
            ]
   }
 } else {
   assert(false, "Unsupported platform")
 }