Remove the old package manager

mojo/shell/switches.cc

 // Copyright 2013 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.
 
 #include "mojo/shell/switches.h"
 
 namespace mojo {
 namespace switches {
 
-// Uses the mojo:package_manager application instead of the builtin one.
-const char kDontUseRemotePackageManager[] = "dont-use-remote-package-manager";
-
 // Disables the sandbox for debugging.
 const char kNoSandbox[] = "no-sandbox";
 
 // If set apps downloaded are saved in with a predictable filename, to help
 // remote debugging: when gdb is used through gdbserver, it needs to be able to
 // find locally any loaded library. For this, gdb use the filename of the
 // library. When using this flag, the application are named with the sha256 of
 // their content.
 const char kPredictableAppFilenames[] = "predictable-app-filenames";
 
 // Load apps in a single processes.
 const char kSingleProcess[] = "single-process";
 
 }  // namespace switches
 }  // namespace mojo