Update mojo sdk to rev f6c8ec07c01deebc13178d516225fd12695c3dc2

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.
 
-source_set("utility") {
+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",
   ]
 
-  deps = [
-    "//mojo/public/cpp/bindings:callback",
-    "//mojo/public/cpp/system",
+  mojo_sdk_deps = [
+    "mojo/public/cpp/bindings:callback",
+    "mojo/public/cpp/system",
   ]
 
   if (is_win) {
     # See crbug.com/342893:
     sources -= [
       "mutex.h",
       "thread.h",
       "lib/mutex.cc",
       "lib/thread.cc",
     ]
   }
 }