Version 3.29.70.1 (merged r24071)

Fix type in idle time undershot histogram name

R=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/590063002

git-svn-id: https://v8.googlecode.com/svn/trunk@24107 ce2b1a6d-e550-0410-aec6-3dcde31c8c00