Add multiplexing of message pipes in the new EDK.

third_party/mojo/src/mojo/edk/embedder/embedder.cc

Index: third_party/mojo/src/mojo/edk/embedder/embedder.cc
diff --git a/third_party/mojo/src/mojo/edk/embedder/embedder.cc b/third_party/mojo/src/mojo/edk/embedder/embedder.cc
index 9daa0517dc18e01ba5cb39a37eaee94c50147897..175680f3ff18d67d8b7d8e9c688ff888605bf6c8 100644
--- a/third_party/mojo/src/mojo/edk/embedder/embedder.cc
+++ b/third_party/mojo/src/mojo/edk/embedder/embedder.cc
@@ -63,6 +63,7 @@ class NewEDKProcessDelegate : public mojo::edk::ProcessDelegate {
 
   void OnShutdownComplete() {
     passed_in_delegate_->OnShutdownComplete();
+    delete this;
   }
 
  private:
@@ -246,6 +247,8 @@ void ShutdownIPCSupportOnIOThread() {
   internal::g_ipc_support->ShutdownOnIOThread();
   delete internal::g_ipc_support;
   internal::g_ipc_support = nullptr;
+  delete g_wrapper_process_delegate;
+  g_wrapper_process_delegate = nullptr;
 }
 
 void ShutdownIPCSupport() {