[mojo] Use a pipe path to initialise Mojo in elevated utility processes.

mojo/mojo_edk.gyp

 # 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.
 
 {
   'includes': [
     'mojo_variables.gypi',
   ],
   'target_defaults' : {
     'include_dirs': [
@@ skipping 50 matching lines @@
         'MOJO_SYSTEM_IMPL_IMPLEMENTATION',
         'MOJO_SYSTEM_IMPLEMENTATION',
         'MOJO_USE_SYSTEM_IMPL',
       ],
       'sources': [
         'edk/embedder/configuration.h',
         'edk/embedder/embedder.cc',
         'edk/embedder/embedder.h',
         'edk/embedder/embedder_internal.h',
         'edk/embedder/entrypoints.cc',
+        'edk/embedder/named_platform_channel_pair_win.cc',
+        'edk/embedder/named_platform_channel_pair_win.h',
         'edk/embedder/platform_channel_pair.cc',
         'edk/embedder/platform_channel_pair.h',
         'edk/embedder/platform_channel_pair_posix.cc',
         'edk/embedder/platform_channel_pair_win.cc',
         'edk/embedder/platform_channel_utils_posix.cc',
         'edk/embedder/platform_channel_utils_posix.h',
         'edk/embedder/platform_handle.cc',
         'edk/embedder/platform_handle.h',
         'edk/embedder/platform_handle_utils.h',
         'edk/embedder/platform_handle_utils_posix.cc',
@@ skipping 190 matching lines @@
         'mojo_public.gyp:mojo_public_test_support',
         'mojo_system_impl',
         'mojo_test_support_impl',
       ],
       'sources': [
         'edk/test/run_all_perftests.cc',
       ],
     },
   ],
 }