What would be needed to be perfectly fine legally would be to take the chrome repository, and fork it.

This fork would need to have none of the source-code of courgette - that would need totally ripped out of any revision history that was kept.

Then build a binary from that.

You will certainly win any court case that ensues, if competently represented.

However, that does not mean that you, or if it's a Nokia repository, Nokia, won't face time in court - for which you may not get your costs back.