Interviewing is different from a real job. You need to show you can do more than look up solutions on the web.
I can't blame you for trying to cheat your way into a job and I certainly blame the interviewer for not seeing through your cheat, but make no mistake: you cheated.
It is generally considered cheating by Google phone interview standards, the interviewer probably was satisfied by the other answers, plus the fact that the interviewee immediately and casually owned up to it probably indicated that it hadn't been made clear that it was disallowed.
Interviewing is different from a real job. You need to show you can do more than look up solutions on the web.
I can't blame you for trying to cheat your way into a job and I certainly blame the interviewer for not seeing through your cheat, but make no mistake: you cheated.