Fix a couple of header guards.

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

Review URL: https://codereview.chromium.org/180633007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254467 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254467