[mojo-edk] Disable clean shutdown behavior
[mojo-edk] Disable clean shutdown behavior

Due to the associated bug, we've started encountering (in
browser tests) situations where a process has outstanding
proxy ports that never get cleaned up. This results in
clean shutdown never being possible.

This CL disables clean shutdown behavior until the root
of the bug is fixed.

Note that this may introduce other subtle failures,
because without clean shutdown, a process may exit
immediately after transferring a pipe endpoint elsewhere.
This can result in a broken pipe.

BUG=589864
TBR=amistry@chromium.org

Review URL: https://codereview.chromium.org/1892123002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387615}

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