Apply gn format with 'sources' sorting to src/

third_party/mojo/src/mojo/public/cpp/utility/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("utility") {
   sources = [
-    "mutex.h",
-    "run_loop.h",
-    "run_loop_handler.h",
-    "thread.h",
     "lib/mutex.cc",
     "lib/run_loop.cc",
     "lib/thread.cc",
     "lib/thread_local.h",
     "lib/thread_local_posix.cc",
     "lib/thread_local_win.cc",
+    "mutex.h",
+    "run_loop.h",
+    "run_loop_handler.h",
+    "thread.h",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/cpp/bindings:callback",
     "mojo/public/cpp/system",
   ]
 
   if (is_win) {
     # See crbug.com/342893:
     sources -= [
+      "lib/mutex.cc",
+      "lib/thread.cc",
       "mutex.h",
       "thread.h",
-      "lib/mutex.cc",
-      "lib/thread.cc",
     ]
   }
 }