IPC: remove traces of an old histogram.
IPC: remove traces of an old histogram.

BUG=21827
TEST=none

Review URL: http://codereview.chromium.org/273060

git-svn-id: http://src.chromium.org/svn/trunk/src@29038 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: cd7b81ae6b70522878eef04b633dcf2c738d92fe
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser