Move //mojo/services/X/public/... to //mojo/services/X/... (part 2).

mojo/services/http_server/cpp/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("//build/module_args/mojo.gni")
 import("$mojo_sdk_root/mojo/public/mojo_sdk.gni")
 
 mojo_sdk_source_set("cpp") {
   restrict_external_deps = false
-  public_configs = [ "../../../public/build/config:mojo_services" ]
+  public_configs = [ "../../public/build/config:mojo_services" ]
   sources = [
     "http_server_util.h",
     "lib/http_server_util.cc",
   ]
 
   deps = [
     "../interfaces",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/cpp/environment",
     "mojo/public/cpp/system",
   ]
 }