Update perf expectations

xp-release-dual-core: moz 3% virtual memory regression.
http://build.chromium.org/f/chromium/perf/xp-release-dual-core/moz/report.html?history=50&rev=126809&graph=vm_peak_r

Started in 126412, when tcmalloc was updated to branch r144.

BUG=118329
TBR=cmp
Review URL: https://chromiumcodereview.appspot.com/9699062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126832 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf_expectations/perf_expectations.json

@@ -126,7 +126,7 @@
  "xp-release-dual-core/moz/total_op_b/IO_op_b": {"reva": 122236, "revb": 122547, "improve": 7427, "regress": 9777, "sha1": "9a6a82d5"},
  "xp-release-dual-core/moz/total_op_r/IO_op_r": {"reva": 122236, "revb": 122547, "improve": 1418, "regress": 2234, "sha1": "41c80eca"},
  "xp-release-dual-core/moz/vm_peak_b/vm_pk_b": {"reva": 120708, "revb": 120785, "improve": 5179187, "regress": 7646823, "sha1": "1e530ce7"},
- "xp-release-dual-core/moz/vm_peak_r/vm_pk_r": {"reva": 121689, "revb": 121954, "improve": 16420864, "regress": 21968487, "sha1": "98aa403a"},
+ "xp-release-dual-core/moz/vm_peak_r/vm_pk_r": {"reva": 126419, "revb": 126809, "improve": 24888115, "regress": 27628340, "sha1": "49b98332"},
  "xp-release-dual-core/startup/warm/t": {"reva": 76825, "revb": 77094, "improve": -107, "regress": 141, "sha1": "e0dcf672"},
  "xp-release-dual-core/v8_benchmark/score/score": {"reva": 68696, "revb": 69071, "improve": 892, "regress": -668, "sha1": "75a383d3"},
  "xp-release-single-core/dhtml/times/t": {"reva": 98602, "revb": 99994, "improve": -2888, "regress": 3391, "sha1": "30683762"},