Mojo EDK: Add safe process connection API

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index a7c2fa3247644cf105f2915fbc9b8ad8d150d441..0ef85c81e601b624fd8d31388ca93f92c2ef9074 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -33,6 +33,7 @@
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_platform_file.h"
 #include "media/media_features.h"
+#include "mojo/edk/embedder/pending_process_connection.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 #include "mojo/public/cpp/bindings/associated_binding_set.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
@@ -428,7 +429,7 @@ class CONTENT_EXPORT RenderProcessHostImpl
         BrowserThread::GetTaskRunnerForThread(BrowserThread::UI));
   }
 
-  std::string child_token_;
+  std::unique_ptr<mojo::edk::PendingProcessConnection> pending_connection_;
 
   std::unique_ptr<ChildConnection> child_connection_;
   int connection_filter_id_ =