Remove unused histogram definitions

R=marja@chromium.org
LOG=n
BUG=none

Review URL: https://codereview.chromium.org/572923002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23980 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'