Minor style tweaks to tls

This is only style changes, no functional change.

BUG=none
TEST=none
R=darin@chromium.org

Review URL: https://codereview.chromium.org/105563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238854 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238854