Update Mac sizes perf expectations, reduce tolerance to 1%

tools/perf_expectations/perf_expectations.json

Index: tools/perf_expectations/perf_expectations.json
diff --git a/tools/perf_expectations/perf_expectations.json b/tools/perf_expectations/perf_expectations.json
index 858241e5e1cddf9d136ce7ca4b535a4a78f8e22f..6bfbeb894c72b2a24a7245aeb66d4b3d77a72b0b 100644
--- a/tools/perf_expectations/perf_expectations.json
+++ b/tools/perf_expectations/perf_expectations.json
@@ -381,9 +381,9 @@
  "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": 305049, "revb": 305099, "type": "absolute", "better": "lower", "improve": 150118604, "regress": 165929165, "sha1": "6133e499"},
+ "mac-release/sizes/Chromium.app/Chromium.app": {"reva": 326940, "revb": 326990, "type": "absolute", "better": "lower", "improve": 155912232, "regress": 159128167, "tolerance": 0.01, "sha1": "0e4899e7"},
  "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": 314575, "revb": 314597, "type": "absolute", "better": "lower", "improve": 96029781, "regress": 106138196, "sha1": "e601ccfe"},
+ "mac-release/sizes/ChromiumFramework/ChromiumFramework": {"reva": 326940, "revb": 326990, "type": "absolute", "better": "lower", "improve": 102571179, "regress": 104681006, "tolerance": 0.01, "sha1": "f9819a70"},
  "mac-release/sizes/chrome-si/initializers": {"reva": 281731, "revb": 281731, "type": "absolute", "better": "lower", "improve": 0, "regress": 0, "tolerance": 0, "sha1": "01759b7f"},
  "win-release/media_tests_av_perf/audio_latency/latency": {"reva": 199840, "revb": 201303, "type": "absolute", "better": "lower", "improve": 57, "regress": 69, "sha1": "169d47dd"},
  "win-release/media_tests_av_perf/audio_latency/latency_bg_clip": {"reva": 199840, "revb": 201303, "type": "absolute", "better": "lower", "improve": 66, "regress": 78, "sha1": "708a71af"},