Update Chromium.app/Chromium.app sizes.

tools/perf_expectations/perf_expectations.json

Index: tools/perf_expectations/perf_expectations.json
===================================================================
--- tools/perf_expectations/perf_expectations.json	(revision 271559)
+++ tools/perf_expectations/perf_expectations.json	(working copy)
@@ -381,7 +381,7 @@
  "linux-release/sizes/nacl_helper_bootstrap-text/text": {"reva": 256743, "revb": 256743, "type": "absolute", "better": "lower", "improve": 4882, "regress": 5396, "sha1": "ffc106e5"},
  "linux-release/sizes/nacl_helper_bootstrap/nacl_helper_bootstrap": {"reva": 114822, "revb": 115019, "type": "absolute", "better": "lower", "improve": 8776, "regress": 9700, "sha1": "3f284fed"},
  "linux-release/sizes/totals-textrel/textrel": {"reva": 205083, "revb": 206071, "type": "absolute", "better": "lower", "improve": 1075, "regress": 1189, "sha1": "69d07fda"},
- "mac-release/sizes/Chromium.app/Chromium.app": {"reva": 270042, "revb": 270042, "type": "absolute", "better": "lower", "improve": 119164108, "regress": 131707700, "sha1": "be50dfb9"},
+ "mac-release/sizes/Chromium.app/Chromium.app": {"reva": 271545, "revb": 271559, "type": "absolute", "better": "lower", "improve": 129966080, "regress": 143646720, "sha1": "ab596e70"},
  "mac-release/sizes/Chromium/Chromium": {"reva": 165473, "revb": 165473, "type": "absolute", "better": "lower", "improve": 8132, "regress": 8988, "sha1": "8e448691"},
  "mac-release/sizes/ChromiumFramework/ChromiumFramework": {"reva": 255987, "revb": 256040, "type": "absolute", "better": "lower", "improve": 72472577, "regress": 80101271, "sha1": "566fdec6"},
  "mac-release/sizes/chrome-si/initializers": {"reva": 251218, "revb": 251218, "type": "absolute", "better": "lower", "improve": 1, "regress": 1, "tolerance": 0, "sha1": "557cb121"},