With the latest update (Jan 14, 2015), Chrome forces us to use the new interface for People Switching as following:
and this is really annoying, way more complicated than the old one. People's yelling at each other asking how to reverse the update...blah blah blah...
Here you go, there is a Chrome's setting (advanced users) to turn that new interface off:
1. Go to chrome://flags/#enable-new-avatar-menu
2. In the "Enable the new avatar menu Mac, Windows, Linux" setting, choose Disable.
3. Click "Relaunch"
and the world is happy now!