Fallback to on-line password check if local fails.

Relying on local-auth is not sufficient because locking can be enabled when no local credentials are present.  Also, changing the password outside of this instance of Chrome would require using the old password to unlock, now no longer the case.

This affects only new-profile-management.

BUG=328017

Review URL: https://codereview.chromium.org/99373008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243575 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243575