Revert 84965 - Test for empty passphrase in Sync setup process. Show the incorrect passphrase message if the user wants to enter an empty passphrase.
Revert 84965 - Test for empty passphrase in Sync setup process.
Show the incorrect passphrase message if the user wants to enter an empty passphrase.

BUG=81967
TEST=Test manually.

Review URL: http://codereview.chromium.org/6966008

TBR=sfeuz@chromium.org
Review URL: http://codereview.chromium.org/7005032

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@84972 0039d316-1c4b-4281-b951-d872f2087c98

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