Delete the tracing service

components/font_service/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("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 
 source_set("lib") {
   sources = [
     "font_service_app.cc",
     "font_service_app.h",
   ]
 
   deps = [
     "//base",
     "//components/font_service/public/interfaces",
     "//mojo/common:common_base",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//services/service_manager/public/cpp",
-    "//services/tracing/public/cpp",
   ]
 
   public_deps = [
     "//skia",
   ]
 }
 
 service("font_service") {
   sources = [
     "main.cc",
   ]
 
   deps = [
     ":lib",
     "//base",
     "//mojo/public/c/system",
     "//services/service_manager/public/cpp",
   ]
 }
 
 service_manifest("manifest") {
   name = "font_service"
   source = "manifest.json"
 }