Revert of Use new people.get api instead of oauth2/v1/userinfo. (https://codereview...

Revert of Use new people.get api instead of oauth2/v1/userinfo. (https://codereview.chromium.org/257773002/)

Reason for revert:
[Sheriff]Speculative revert for breaking CrOS:
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%282%29/builds/23489

Will reland if it doesn't help.

Original issue's description:
> Use new people.get api instead of oauth2/v1/userinfo.
> Consolidate all uses into main helper class.
>
> Details about new api: https://developers.google.com/+/api/latest/people/get
>
> Format of returned response: https://developers.google.com/+/api/latest/people#resource
>
> BUG=320354
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=267068

TBR=atwilson@chromium.org,noms@chromium.org,guohui@chromium.org,gene@chromium.org,rogerta@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=320354

Review URL: https://codereview.chromium.org/265563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267114 0039d316-1c4b-4281-b951-d872f2087c98