[Pkg-chromium-maint] Bug#748867: Silence

[k_f]

Chromium is silence about API-keys if you just provide any contend in 
the environment variables for API-key runtime setup since this you may 
want to use spaces ("no key") if you don't need the Google APIs (eg 
Translate). The start-up-script could just provide

export GOOGLE_API_KEY=" "
export GOOGLE_DEFAULT_CLIENT_ID=" "
export GOOGLE_DEFAULT_CLIENT_SECRET=" "

if they aren't set
The google services like translate seem not to work if you do so (tested 
translate and it did not) and i don't think that you need your clients 
to implicit sign a Google contract as the real API-keys seem to do

friendly greeting
Karl