More cleanup of GYP code in ui/ozone

ui/ozone/platform/cast/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.
 
 import("//build/config/chromecast_build.gni")
 import("//ui/ozone/ozone.gni")
 
 visibility = [
   "//ui/ozone/*",
   "//chromecast/*",
 ]
 
-# GYP version: cast.gypi:ozone_platform_cast
 # TODO(slan): gn check needs deps on ozone and media to pass. Correct this.
 source_set("cast") {
   sources = [
     "client_native_pixmap_factory_cast.cc",
     "client_native_pixmap_factory_cast.h",
     "gl_surface_cast.cc",
     "gl_surface_cast.h",
     "overlay_manager_cast.cc",
     "overlay_manager_cast.h",
     "ozone_platform_cast.cc",
@@ skipping 18 matching lines @@
     "//chromecast:chromecast_features",
     "//chromecast/base:base",
     "//chromecast/graphics:libcast_graphics_1.0",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/ozone:ozone_base",
     "//ui/ozone/common",
     "//ui/platform_window",
   ]
 }