Fix some TODO(GYP) in the GN build.

ui/ozone/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("//build/config/ui.gni")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
 
 assert(use_ozone)
 
@@ skipping 140 matching lines @@
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/platform_window",
   ]
 
   deps = [
     ":generate_constructor_list",
     ":generate_ozone_platform_list",
   ]
 
-  # TODO(GYP) the GYP version has a way to add additional dependencies via
-  # build flags.
   deps += ozone_platform_deps
 
   # Platforms are always linked into //ui/ozone and can include our headers.
   allow_circular_includes_from = ozone_platform_deps
 
   # This is used for platform tests.
   visibility += [ "//ui/ozone/platform/*" ]
 }
 
 component("ozone") {
@@ skipping 61 matching lines @@
     "//ui/gfx/geometry",
   ]
 
   # Add tests of platform internals.
   deps += ozone_platform_test_deps
 
   # Platform tests link ozone statically. Make sure we're not getting a
   # 2nd copy of any code via the component.
   assert_no_deps = [ "//ui/ozone" ]
 }