Move third_party/mojo/src/mojo/public to mojo/public

mojo/public/cpp/utility/tests/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_sdk.gni")
 
 mojo_sdk_source_set("tests") {
   testonly = true
 
   sources = [
@@ skipping 12 matching lines @@
   ]
 
   # crbug.com/342893
   if (!is_win) {
     sources += [
       "mutex_unittest.cc",
       "thread_unittest.cc",
     ]
   }
 }