[mojo-edk] Expose portable API for platform handle wrapping

mojo/mojo_platform_handle.gyp

 # Copyright 2016 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.
 
 {
   'variables': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
   },
   'targets': [
     {
       # GN version: //mojo/platform_handle:platform_handle/platform_handle_impl
       'target_name': 'platform_handle',
-      'type': '<(component)',
-      'include_dirs': [
-        '../..',
-      ],
-      'defines': [
-        'PLATFORM_HANDLE_IMPLEMENTATION'
-      ],
-      'sources': [
-        'platform_handle/platform_handle.h',
-        'platform_handle/platform_handle_functions.h',
-        'platform_handle/platform_handle_functions.cc',
-      ],
-      'dependencies': [
-        'mojo_edk.gyp:mojo_system_impl',
-        'mojo_public.gyp:mojo_cpp_bindings',
-      ]
+      'type': 'none',
     }
   ]
 }