They have served they purpose well, but now it's time to retire.
It's one of the things that draggen in the bad dependency of chrome/common
on chrome/browser, and is sufficiently small now to stub things out individually.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/593037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@38639 0039d316-1c4b-4281-b951-d872f2087c98