Remove onRestarted event from Calculator sample app

It was using it to manually reopen its window if a user had it running when they logged out of Chrome OS. There's now a general-purpose mechanism to restart running apps, so we don't need the manual code anymore. This also removes references to the storage API from the app, which makes it easier to use as a demo for app_shell (which doesn't yet support storage).

This is effectively a revert of crrev.com/11316346

BUG=348768
TEST=none, it's just sample code

Review URL: https://codereview.chromium.org/185793006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254901 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254901