Second part of Removed access to prefs that does not work on Android
Second part of Removed access to prefs that does not work on Android

This CL addresses the prefs registered by:
SyncPromoUI::RegisterUserPrefs

Later CL: 
Browser::RegisterUserPrefs 

First part=9949033

BUG=120802
TEST=Compiled and made diffed the link error to make sure they are the same.

Review URL: http://codereview.chromium.org/10007023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@131945 0039d316-1c4b-4281-b951-d872f2087c98

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