Makes wait-for-debugger=content_browser work for mash

services/service_manager/runner/host/child_process_host.cc

Index: services/service_manager/runner/host/child_process_host.cc
diff --git a/services/service_manager/runner/host/child_process_host.cc b/services/service_manager/runner/host/child_process_host.cc
index 5d77b7b7270bb5c02cea790e8d32c0a266ebb7b4..faf2ba589e29e34ca9b70a5ba18bc9a46b4afdf3 100644
--- a/services/service_manager/runner/host/child_process_host.cc
+++ b/services/service_manager/runner/host/child_process_host.cc
@@ -81,8 +81,9 @@ mojom::ServicePtr ChildProcessHost::Start(
 
   child_command_line->AppendArguments(parent_command_line, false);
 
+  child_command_line->AppendSwitchASCII(::switches::kProcessServiceName,
+                                        target.name());
 #ifndef NDEBUG
-  child_command_line->AppendSwitchASCII("n", target.name());
   child_command_line->AppendSwitchASCII("u", target.user_id());
 #endif