css Mixins of browser support are not applied in production

[Perezmarc]

Hi!

I noticed that when generating production build (bot with ng serve & ng build), mixins css such as '-webkit-flex:' are not applied. In dev it works properly.

First I thought it was because of my command build
ng build -prod -aot -sm false --suppress-sizes true --vendor-chunk false

But realised that even this command gives me an error
ng build -prod -aot

---

OS?

Mac OS Sierra

Versions.

angular-cli: 1.0.0-beta.22-1
node: 7.0.0
os: darwin x64

Repro steps.

ng serve --prod --aot

Mention any other details that might be useful.

[Perezmarc]

my bad: #3164

It should be working in latest

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