Update perf expectations

Update perf expectations

mac-release-10.5: 100% vm size final memory increase for chrome processes (excluding browser)
http://build.chromium.org/f/chromium/perf/mac-release-10.5/intl2/report.html?history=300&rev=126775&graph=vm_size_final_r
mac-release-10.5: 50% vm size final memory increase for chrome processes (including browser)
http://build.chromium.org/f/chromium/perf/mac-release-10.5/intl2/report.html?history=300&rev=126775&graph=vm_size_final_t

seems to start in 124803, "Automatically start the GPU process 5s after browser startup."

BUG=118321
TBR=cmp
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=126830

[cmp, 2012-03-15 16:33:36]

lgtm