[Service Manager] Get rid of dynamic service discovery

services/tracing/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("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 
 service("tracing") {
   sources = [
     "main.cc",
   ]
 
   deps = [
     ":lib",
     "//mojo/public/cpp/system",
     "//services/service_manager/public/cpp",
   ]
-
-  data_deps = [
-    ":manifest",
-  ]
 }
 
 service_manifest("manifest") {
   name = "tracing"
   source = "manifest.json"
 }
 
 source_set("lib") {
   sources = [
     "data_sink.cc",
     "data_sink.h",
     "recorder.cc",
     "recorder.h",
     "service.cc",
     "service.h",
   ]
 
   deps = [
     "//base",
     "//mojo/common:common_base",
     "//services/service_manager/public/cpp",
     "//services/tracing/public/interfaces",
   ]
 }