Update vista morejs.

Looks like we got faster around r50331 (WebKit roll
61498:61520).

BUG=none
TEST=vista morejs is green
TBR=nsylvain@chromium.org

Review URL: http://codereview.chromium.org/3049002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@52926 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf_expectations/perf_expectations.json

@@ -25,7 +25,7 @@
  "vista-release-dual-core/dhtml/times/t": {"delta": 10, "var": 20},
  "vista-release-dual-core/intl1/times/t": {"delta": 140, "var": 60},
  "vista-release-dual-core/intl2/times/t": {"delta": 40, "var": 40},
- "vista-release-dual-core/morejs/times/t": {"delta": 0, "var": 30},
+ "vista-release-dual-core/morejs/times/t": {"delta": -120, "var": 30},
  "vista-release-dual-core/moz/times/t": {"delta": 0, "var": 60},
  "vista-release-dual-core/startup/times/t": {"delta": 0, "var": 10},
  "vista-release-single-core/dhtml/times/t": {"delta": 0, "var": 60},