Add member ownership_passes_to_ipc_ to SharedMemoryHandle on windows.

ipc/ipc_message_utils.cc

Index: ipc/ipc_message_utils.cc
diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
index ea88b55a2a5129260bdc984b35e97ee0171b9ad5..277c2ff75c73c8f391d4dae3732d33a4e6478ace 100644
--- a/ipc/ipc_message_utils.cc
+++ b/ipc/ipc_message_utils.cc
@@ -665,6 +665,11 @@ void ParamTraits<base::SharedMemoryHandle>::Write(Message* m,
   if (p.NeedsBrokering()) {
     HandleWin handle_win(p.GetHandle(), HandleWin::DUPLICATE);
     ParamTraits<HandleWin>::Write(m, handle_win);
+
+    // If the caller intended to pass ownership to the IPC stack, release a
+    // reference.
+    if (p.OwnershipPassesToIPC())
+      p.Close();
   } else {
     m->WriteInt(HandleToLong(p.GetHandle()));
   }