Remove non-used deprecated method from ActivityStatus.

BUG=
NOTRY=true
R=yfriedman@chromium.org

Review URL: https://codereview.chromium.org/27510006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229217 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229217