[Print Preview] Re-add flags for register promos

Register promos are not cleared for M34. Re-add the flags for the register
promo.

BUG=350488

Review URL: https://codereview.chromium.org/189483006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256014 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256014