Move package_manager into mojo/shell

mojo/runner/register_local_aliases.h

 // Copyright 2015 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.
 
 #ifndef MOJO_RUNNER_REGISTER_LOCAL_ALIASES_H_
 #define MOJO_RUNNER_REGISTER_LOCAL_ALIASES_H_
 
 namespace mojo {
-namespace package_manager {
+namespace shell {
 class PackageManagerImpl;
 }
 
 namespace runner {
 
-void RegisterLocalAliases(mojo::package_manager::PackageManagerImpl* manager);
+void RegisterLocalAliases(shell::PackageManagerImpl* manager);
 
 }  // namespace runner
 }  // namespace mojo
 
 #endif  // MOJO_RUNNER_REGISTER_LOCAL_ALIASES_H_