Close NaCl IPC channel when the NaClDesc is released

components/nacl/loader/nacl_ipc_adapter.cc

Index: components/nacl/loader/nacl_ipc_adapter.cc
diff --git a/components/nacl/loader/nacl_ipc_adapter.cc b/components/nacl/loader/nacl_ipc_adapter.cc
index dc521ba8f1ea1de923bffc462dbf90c084273430..03d41faed5284e372bc63762069592e5a6a01ecc 100644
--- a/components/nacl/loader/nacl_ipc_adapter.cc
+++ b/components/nacl/loader/nacl_ipc_adapter.cc
@@ -67,7 +67,12 @@ struct DescThunker {
   explicit DescThunker(NaClIPCAdapter* adapter_arg)
       : adapter(adapter_arg) {
   }
+
+  ~DescThunker() { adapter->CloseChannel(); }
+
   scoped_refptr<NaClIPCAdapter> adapter;
+
+  DISALLOW_COPY_AND_ASSIGN(DescThunker);
 };
 
 NaClIPCAdapter* ToAdapter(void* handle) {