Delete some dead code.

Found by a tweaked -Wunused-member-function Nuno Lopes is working on.

BUG=none
R=brettw@chromium.org, miket@chromium.org, rsleevi@chromium.org, sky@chromium.org
TBR=rogerta, sky

Review URL: https://codereview.chromium.org/213363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259767 0039d316-1c4b-4281-b951-d872f2087c98