Update expectations for xpdual/moz/vm_peak_*.
Update expectations for xpdual/moz/vm_peak_*.

There was a vm_peak_* improvement recently, possibly
caused by WebKit roll in r42192, 56306:56312, but more
likely due to an infrastructure change made by maruel
around r42200.

BUG=none
TEST=moz perf step is green
TBR=nsylvain@chromium.org

Review URL: http://codereview.chromium.org/1142008

git-svn-id: http://src.chromium.org/svn/trunk/src@42233 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c5e16adac3486cdbe4fc20939890f8ad73f1f54e
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