EDK: Add a MakeUnique and use it somewhere.

mojo/edk/system/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("../mojo_edk.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 49 matching lines @@
     "handle_table.cc",
     "handle_table.h",
     "incoming_endpoint.cc",
     "incoming_endpoint.h",
     "ipc_support.cc",
     "ipc_support.h",
     "local_data_pipe_impl.cc",
     "local_data_pipe_impl.h",
     "local_message_pipe_endpoint.cc",
     "local_message_pipe_endpoint.h",
+    "make_unique.h",
     "mapping_table.cc",
     "mapping_table.h",
     "master_connection_manager.cc",
     "master_connection_manager.h",
     "memory.cc",
     "memory.h",
     "message_in_transit.cc",
     "message_in_transit.h",
     "message_in_transit_queue.cc",
     "message_in_transit_queue.h",
@@ skipping 157 matching lines @@
   deps = [
     ":system",
     ":test_utils",
     "../test:test_support",
     "//base",
     "//base/test:test_support",
     "//base/test:test_support_perf",
     "//testing/gtest",
   ]
 }