Chrome Version: 
Chrome OS Version: <From about:version: Platform x.x.x.x>
Chrome OS Platform: <Make/model of computer running Chrome OS>
Network info: <network, encryption type, router model (if known)>

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1) Build chrome with is_debug=true option.
(2) Run chrome with --enable-zip-archiver-unpacker option.
(3) Open a zip file in the Files app.


The notification says either the extension is scanning the file, but fail to mount.


JS console
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NativeClient: NaCl module crashed
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native console
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assertion "var_dict.Get(request::key::kOperation).is_int()" failed: file "../../chrome/browser/resources/chromeos/zip_archiver/cpp/module.cc", line 168, function: virtual void NaclArchiveInstance::HandleMessage(const pp::Var &)
** abort() called

** Signal 4 from untrusted code: pc=7ebd0050be80
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