Revert 242290 "Turn on inline signin by default"

I want to speculatively revert r241609, and this is causing merge conflicts.

> Turn on inline signin by default
> 
> BUG=
> 
> Review URL: https://codereview.chromium.org/115393004

TBR=guohui@chromium.org

Review URL: https://codereview.chromium.org/109163003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242297 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242297