shiny/driver/gldriver: fold cocoa.h into cocoa.go.

The .h file is only included in one place. We might as well inline it.

Change-Id: I69726ffb89c45a8a9b1b3db1e462fa3021121cd5
Reviewed-on: https://go-review.googlesource.com/14230
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2 files changed