Fix logic error in passphrase match detection if the confirmation is blank.  Also don't check for passphrase mismatch until submission, it creates jarring UI when it's done while typing.
Fix logic error in passphrase match detection if the confirmation is blank.  Also don't check for passphrase mismatch until submission, it creates jarring UI when it's done while typing.

BUG=69114
TEST=setup passphrase

Review URL: http://codereview.chromium.org/6133007

git-svn-id: http://src.chromium.org/svn/trunk/src@71013 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8b6c19df1ae91f791cfb25c19ad94f6dec956589
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser