Fix style issues from the registration promo CL

Fix style issues raised in https://codereview.chromium.org/109323005/ after it
was closed.

BUG=326718

Review URL: https://codereview.chromium.org/111753003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242575 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242575