Cant install extensions on dartium

[DartBot]

This issue was originally filed by @pjako

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What steps will reproduce the problem?
Open in dartium:
https://github.com/downloads/benvanik/WebGL-Inspector/WebGL-Inspector-v1.9.crx

What is the expected output?
Installation window for the extension
What do you see instead?
it just downloads the extension
Why do you need extensions on dartium at the moment?
Im creating webgl content and the WebGL inspector addon ist extremly usefull for debuging
http://benvanik.github.com/WebGL-Inspector/

What version of the product are you using? On what operating system?
7785
MacOSX

Please provide any additional information below.

[DartBot]

This comment was originally written by antonm@google.com

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Set owner to antonm@google.com.
Added Area-Dartium, Triaged labels.

[vsmenon]

p4jako: Can you try with a fresh Chromium profile? We recently removed a builtin extension we were bundling with Dartium. It's possible that the traces of this in your profile are causing problems. A fresh profile may fix.

[DartBot]

This comment was originally written by antonm@google.com

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We heard no response since then, closing as stale for now. Please, reopen if it's still an issue.

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Added AssumedStale label.