Revert "ecryptfs: modify write path to encrypt page in writepage"

This reverts commit b83351b773731a01ae9bf423b6b22d92821797bb.

BUG=chromium-os:13658,chromium-os:13677
TEST=dpolukhin tested and confirmed it fixed the problem per http://code.google.com/p/chromium-os/issues/detail?id=13658#c28

Change-Id: Ia753af01c38eb91663357cc5d17a79751ec110f3

Review URL: http://codereview.chromium.org/6720011
6 files changed