Eliminate mojo::Shell client lib class

mojo/services/package_manager/package_manager.cc

Index: mojo/services/package_manager/package_manager.cc
diff --git a/mojo/services/package_manager/package_manager.cc b/mojo/services/package_manager/package_manager.cc
index ce6e1a69e528c1933d7c3c04a291be186c5bb4e8..54ec917d6c080d86449085a7bcec417cb19b9450 100644
--- a/mojo/services/package_manager/package_manager.cc
+++ b/mojo/services/package_manager/package_manager.cc
@@ -107,9 +107,6 @@ PackageManager::PackageManager(base::TaskRunner* blocking_pool,
 }
 PackageManager::~PackageManager() {}
 
-void PackageManager::Initialize(mojo::Shell* shell, const std::string& url,
-                                uint32_t id, uint32_t user_id) {}
-
 bool PackageManager::AcceptConnection(mojo::Connection* connection) {
   connection->AddInterface<mojom::Catalog>(this);
   connection->AddInterface<mojom::Resolver>(this);