Remove some dead code found by scythe.

No functionality change.

BUG=
R=piman@chromium.org

Review URL: https://codereview.chromium.org/138313006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245054 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245054