Update expectations due to improvement in mini_installer.exe size.

TBR=erikwright

Review URL: https://codereview.chromium.org/607683002

Cr-Commit-Position: refs/heads/master@{#296926}

tools/perf_expectations/perf_expectations.json

@@ -737,7 +737,7 @@
  "win-release/media_tests_av_perf/ttp/Wifi_roller.webm": {"reva": 175328, "revb": 176157, "type": "absolute", "better": "lower", "improve": 906.775, "regress": 1184.925, "sha1": "d49e638f"},
  "xp-release/sizes/chrome.dll/chrome.dll": {"reva": 294897, "revb": 294948, "type": "absolute", "better": "lower", "improve": 37547161, "regress": 41570458, "sha1": "363fa5bf"},
  "xp-release/sizes/chrome.exe/chrome.exe": {"reva": 242400, "revb": 242432, "type": "absolute", "better": "lower", "improve": 679014, "regress": 750490, "sha1": "1dafcad6"},
- "xp-release/sizes/mini_installer.exe/mini_installer.exe": {"reva": 294263, "revb": 294461, "type": "absolute", "better": "lower", "improve": 35114188, "regress": 38913639, "sha1": "29d0d1c7"},
+ "xp-release/sizes/mini_installer.exe/mini_installer.exe": {"reva": 296771, "revb": 296791, "type": "absolute", "better": "lower", "improve": 32967219, "regress": 36469709, "sha1": "f4744be2"},
  "xp-release/sizes/setup.exe/setup.exe": {"reva": 255987, "revb": 256040, "type": "absolute", "better": "lower", "improve": 959180, "regress": 1060148, "sha1": "d113e5dd"},
  "load": true
 }