Because gopherjs master branch still needs Go 1.7.
So we either need to include a Go 1.7 with CAMLI_GOPHERJS_GOROOT in the
travis build (which I will look into later), or wait for gopherjs to
support Go 1.8.
Change-Id: I8e991de279bf822e1b5ef64dcae241880fe3eb73
Because gopherjs only supports Go 1.7
Or at least our vendored version does. I'll test later with a more
recent gopherjs version.
Change-Id: I6f30c18136dd9bb25adca899aa49ebe31071187a
mpl