Rename shell namespace to service_manager

mash/app_driver/app_driver.cc

Index: mash/app_driver/app_driver.cc
diff --git a/mash/app_driver/app_driver.cc b/mash/app_driver/app_driver.cc
index 4654a8fca8b67bde4aa54ee46c05b793e11dcb75..857470142e4530b72fefe781f5844daf02ffb6cb 100644
--- a/mash/app_driver/app_driver.cc
+++ b/mash/app_driver/app_driver.cc
@@ -86,12 +86,12 @@ void AppDriver::OnAvailableCatalogEntries(
   }
 }
 
-void AppDriver::OnStart(const shell::Identity& identity) {
+void AppDriver::OnStart(const service_manager::Identity& identity) {
   AddAccelerators();
 }
 
-bool AppDriver::OnConnect(const shell::Identity& remote_identity,
-                          shell::InterfaceRegistry* registry) {
+bool AppDriver::OnConnect(const service_manager::Identity& remote_identity,
+                          service_manager::InterfaceRegistry* registry) {
   return true;
 }