google-api-go-client/integration_test: pass key to test for Travis CI
google-api-go-client/integration_test: pass key to test for Travis CI

Change-Id: If4bae655fa7f81159f497bb80f7802a5503ffb07
Reviewed-on: https://code-review.googlesource.com/3755
Reviewed-by: Michael McGreevy <e70fec140fa6773c6cfd45cb9b436bd6334f4c24@golang.org>

google/google-api-go-client,googleapis/google-api-go-client,google/google-api-go-client,googleapis/google-api-go-client