Rename shell namespace to service_manager

ios/web/web_state/web_state_impl.mm

Index: ios/web/web_state/web_state_impl.mm
diff --git a/ios/web/web_state/web_state_impl.mm b/ios/web/web_state/web_state_impl.mm
index a8a5f0a7c906041782b24f7f5e79ef9ed45aa002..f43b3595e0330596f1f8efbaea8bff05ebc5c0c7 100644
--- a/ios/web/web_state/web_state_impl.mm
+++ b/ios/web/web_state/web_state_impl.mm
@@ -532,9 +532,9 @@ int WebStateImpl::DownloadImage(
                                               callback:callback];
 }
 
-shell::InterfaceRegistry* WebStateImpl::GetMojoInterfaceRegistry() {
+service_manager::InterfaceRegistry* WebStateImpl::GetMojoInterfaceRegistry() {
   if (!mojo_interface_registry_) {
-    mojo_interface_registry_.reset(new shell::InterfaceRegistry);
+    mojo_interface_registry_.reset(new service_manager::InterfaceRegistry);
   }
   return mojo_interface_registry_.get();
 }