Change Mojo URLs to structured names

mojo/services/package_manager/BUILD.gn

 # Copyright 2016 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("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 
 mojo_native_application("package_manager") {
   sources = [
     "main.cc",
@@ skipping 18 matching lines @@
 source_set("lib") {
   sources = [
     "loader.cc",
     "loader.h",
     "package_manager.cc",
     "package_manager.h",
   ]
 
   deps = [
     "//base",
-    "//mojo/common:mojo_scheme_register",
     "//mojo/common:url_type_converters",
     "//mojo/services/package_manager/public/interfaces",
     "//mojo/shell/public/cpp",
     "//mojo/util:filename_util",
     "//net",
   ]
 }