Extract some stuff into PackageManager

mojo/shell/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("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 source_set("shell") {
   output_name = "mojo_shell"
   sources = [
-    "application_fetcher.h",
     "application_instance.cc",
     "application_instance.h",
     "application_loader.h",
     "application_manager.cc",
     "application_manager.h",
     "capability_filter.cc",
     "capability_filter.h",
     "connect_to_application_params.cc",
     "connect_to_application_params.h",
     "content_handler_connection.cc",
     "content_handler_connection.h",
     "data_pipe_peek.cc",
     "data_pipe_peek.h",
     "fetcher.cc",
     "fetcher.h",
     "identity.cc",
     "identity.h",
     "native_runner.h",
+    "package_manager.h",
     "query_util.cc",
     "query_util.h",
     "static_application_loader.cc",
     "static_application_loader.h",
     "switches.cc",
     "switches.h",
   ]
 
   public_deps = [
     "//base",
@@ skipping 13 matching lines @@
     "//mojo/environment:chromium",
     "//mojo/util:filename_util",
   ]
 }
 
 test("mojo_shell_unittests") {
   sources = [
     "application_manager_unittest.cc",
     "capability_filter_unittest.cc",
     "query_util_unittest.cc",
+    "test_package_manager.cc",
+    "test_package_manager.h",
   ]
 
   deps = [
     ":shell",
     ":test_bindings",
     "//base",
     "//mojo/application/public/cpp",
     "//third_party/mojo/src/mojo/edk/test:run_all_unittests",
     "//testing/gtest",
     "//url",
   ]
 }
 
 mojom("test_bindings") {
   sources = [
     "capability_filter_unittest.mojom",
     "test.mojom",
   ]
 }