Update the perf expectations after the roll of third_party/protobuf to r478

tools/perf_expectations/perf_expectations.json

Index: tools/perf_expectations/perf_expectations.json
===================================================================
--- tools/perf_expectations/perf_expectations.json	(revision 216960)
+++ tools/perf_expectations/perf_expectations.json	(working copy)
@@ -1,6 +1,6 @@
 {"linux-release-64/sizes/chrome-bss/bss": {"reva": 216421, "revb": 216430, "type": "absolute", "better": "lower", "improve": 523892, "regress": 579040, "sha1": "0b0195e2"},
  "linux-release-64/sizes/chrome-data/data": {"reva": 203454, "revb": 203474, "type": "absolute", "better": "lower", "improve": 3570183, "regress": 3946094, "sha1": "b0d5e0fc"},
- "linux-release-64/sizes/chrome-si/initializers": {"reva": 196313, "revb": 196318, "type": "absolute", "better": "lower", "improve": 34, "regress": 34, "tolerance": 0, "sha1": "cd47eda1"},
+ "linux-release-64/sizes/chrome-si/initializers": {"reva": 216959, "revb": 216961, "type": "absolute", "better": "lower", "improve": 33, "regress": 33, "tolerance": 0, "sha1": "ebd8c26b"},
  "linux-release-64/sizes/chrome-text/text": {"reva": 203454, "revb": 203474, "type": "absolute", "better": "lower", "improve": 94012670, "regress": 103908994, "sha1": "a8dc15a3"},
  "linux-release-64/sizes/chrome.pak/chrome.pak": {"reva": 214295, "revb": 214296, "type": "absolute", "better": "lower", "improve": 4578193, "regress": 5060109, "sha1": "0785f1c1"},
  "linux-release-64/sizes/chrome/chrome": {"reva": 203454, "revb": 203474, "type": "absolute", "better": "lower", "improve": 128793270, "regress": 142351155, "sha1": "193926f5"},
@@ -365,7 +365,7 @@
  "linux-release/media_tests_av_perf/ttp/Wifi_roller.webm": {"reva": 175328, "revb": 176157, "type": "absolute", "better": "lower", "improve": 867.35, "regress": 1041.075, "sha1": "d99ce51c"},
  "linux-release/sizes/chrome-bss/bss": {"reva": 205093, "revb": 206368, "type": "absolute", "better": "lower", "improve": 316939, "regress": 389240, "sha1": "8d78343e"},
  "linux-release/sizes/chrome-data/data": {"reva": 203454, "revb": 203474, "type": "absolute", "better": "lower", "improve": 1936814, "regress": 2140724, "sha1": "915f9e72"},
- "linux-release/sizes/chrome-si/initializers": {"reva": 196188, "revb": 197308, "type": "absolute", "better": "lower", "improve": 35, "regress": 35, "tolerance": 0, "sha1": "86b46a4e"},
+ "linux-release/sizes/chrome-si/initializers": {"reva": 216959, "revb": 216961, "type": "absolute", "better": "lower", "improve": 34, "regress": 34, "tolerance": 0, "sha1": "69a4e038"},
  "linux-release/sizes/chrome-text/text": {"reva": 203454, "revb": 203474, "type": "absolute", "better": "lower", "improve": 79833368, "regress": 88237335, "sha1": "e1b38def"},
  "linux-release/sizes/chrome-textrel/textrel": {"reva": 135570, "revb": 135664, "type": "absolute", "better": "lower", "improve": 0, "regress": 0, "sha1": "832078e7"},
  "linux-release/sizes/chrome.pak/chrome.pak": {"reva": 214295, "revb": 214296, "type": "absolute", "better": "lower", "improve": 4578193, "regress": 5060109, "sha1": "a95a611b"},