Extract a Connector interface from Shell that can be cloned & passed to other threads

mojo/shell/application_manager.cc

Index: mojo/shell/application_manager.cc
diff --git a/mojo/shell/application_manager.cc b/mojo/shell/application_manager.cc
index aaae40a66c78c04d29c90e99db3732e8d2ab7b14..0ea038a5acb73e7a40d5eacc90ff945e9a7bc4e7 100644
--- a/mojo/shell/application_manager.cc
+++ b/mojo/shell/application_manager.cc
@@ -81,12 +81,12 @@ void ApplicationManager::Connect(scoped_ptr<ConnectParams> params) {
                        params->target().url().spec());
   DCHECK(params->target().url().is_valid());
 
-  if (params->target().user_id() == mojom::Shell::kUserInherit) {
+  if (params->target().user_id() == mojom::Connector::kUserInherit) {
     ApplicationInstance* source = GetApplicationInstance(params->source());
     Identity target = params->target();
     // TODO(beng): we should CHECK source.
     target.set_user_id(source ? source->identity().user_id()
-                              : mojom::Shell::kUserRoot);
+                              : mojom::Connector::kUserRoot);
     params->set_target(target);
   }
 
@@ -182,8 +182,8 @@ void ApplicationManager::CreateInstanceForHandle(
   // client code using this identity.
   CapabilityFilter local_filter = filter->filter.To<CapabilityFilter>();
   // TODO(beng): obtain userid from the inbound connection.
-  Identity target_id(url.To<GURL>(), std::string(), mojom::Shell::kUserInherit,
-                     local_filter);
+  Identity target_id(url.To<GURL>(), std::string(),
+                     mojom::Connector::kUserInherit, local_filter);
   mojom::ShellClientRequest request;
   ApplicationInstance* instance = CreateInstance(target_id, &request);
   instance->BindPIDReceiver(std::move(pid_receiver));
@@ -226,7 +226,7 @@ bool ApplicationManager::ConnectToExistingInstance(
   ApplicationInstance* instance = GetApplicationInstance((*params)->target());
   if (!instance) {
     Identity root_identity = (*params)->target();
-    root_identity.set_user_id(mojom::Shell::kUserRoot);
+    root_identity.set_user_id(mojom::Connector::kUserRoot);
     instance = GetApplicationInstance(root_identity);
     if (!instance) return false;
   }