Mojo EDK: Add safe process connection API

services/service_manager/runner/host/service_process_launcher.h

Index: services/service_manager/runner/host/service_process_launcher.h
diff --git a/services/service_manager/runner/host/service_process_launcher.h b/services/service_manager/runner/host/service_process_launcher.h
index d117f7c82bd079959214bae484aafdd18b396986..39afe1f517c3897247a2ece290cf39d1b85da0b0 100644
--- a/services/service_manager/runner/host/service_process_launcher.h
+++ b/services/service_manager/runner/host/service_process_launcher.h
@@ -15,6 +15,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
 #include "base/synchronization/waitable_event.h"
+#include "mojo/edk/embedder/pending_process_connection.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 #include "services/service_manager/public/interfaces/service_factory.mojom.h"
 
@@ -83,7 +84,7 @@ class ServiceProcessLauncher {
   // Used to initialize the Mojo IPC channel between parent and child.
   std::unique_ptr<mojo::edk::PlatformChannelPair> mojo_ipc_channel_;
   mojo::edk::HandlePassingInformation handle_passing_info_;
-  const std::string child_token_;
+  mojo::edk::PendingProcessConnection process_connection_;
 
   // Since Start() calls a method on another thread, we use an event to block
   // the main thread if it tries to destruct |this| while launching the process.