Delete the tracing service

mash/example/window_type_launcher/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
 
 service("window_type_launcher") {
   testonly = true
 
   sources = [
     "window_type_launcher.cc",
     "window_type_launcher.h",
   ]
 
   deps = [
     "//base",
     "//mash/public/interfaces",
     "//mojo/public/cpp/bindings",
     "//services/service_manager/public/cpp",
     "//services/service_manager/public/interfaces",
-    "//services/tracing/public/cpp",
     "//services/ui/public/cpp",
     "//services/ui/public/interfaces",
     "//skia",
     "//ui/aura",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx/geometry/mojo",
     "//ui/views",
     "//ui/views/mus:for_mojo_application",
   ]
 
   resources = [ "$root_out_dir/views_mus_resources.pak" ]
 
   data_deps = [
     "//services/ui",
   ]
 }
 
 service_manifest("manifest") {
   name = "window_type_launcher"
   source = "manifest.json"
 }