Fixed fatal undefined SpecialGoogleLogin::getHost

getHost moved to GoogleLogin, isn't a function of SpecialGoogleLogin
anymore. Fixed.

Added mHost var to GoogleLogin to don't need to run getHost for every
call again.

Bug: 68316
Change-Id: Iea0f3242efa1460cc884cd5ce18dec2558d359f6
Merge "Fixed fatal undefined SpecialGoogleLogin::getHost"