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feat: add optional headers param to network image (#13128)

* feat: add optional headers params to network image

* fix: addressed comments

* feat: add test

* style: format code
A
Alex committed
e6119282b7a89e879a6616c270d375a882432c1f
Parent: 891a218
Committed by Ian Hickson <ian@hixie.ch> on 11/22/2017, 11:19:52 PM