Sync tests cleanup, consolidate Encryptor mock calls into fixture SetUp
Sync tests cleanup, consolidate Encryptor mock calls into fixture SetUp

This is follow-up from review http://codereview.chromium.org/2835041.

BUG=none
TEST=UserSettingsTest.PersistEmptyToken, UserSettingsTest.PersistNonEmptyToken

Review URL: http://codereview.chromium.org/2854049

git-svn-id: http://src.chromium.org/svn/trunk/src@53091 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7b75beb19b6178b6e37fdc7ac2588298e0029f5e
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