Roll Test262

This roll should cover the last batch of upstream $DONOTEVALUATE
updates.

TBR=gsathya@chromium.org

Bug: v8:7834, v8:8467
Change-Id: Ia1c6e8fa2fd7fd020c5499b3825a8c1e6c14db47
Reviewed-on: https://chromium-review.googlesource.com/c/1338348Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57587}

DEPS

@@ -57,7 +57,7 @@ deps = {
   'v8/test/mozilla/data':
     Var('chromium_url') + '/v8/deps/third_party/mozilla-tests.git' + '@' + 'f6c578a10ea707b1a8ab0b88943fe5115ce2b9be',
   'v8/test/test262/data':
-    Var('chromium_url') + '/external/github.com/tc39/test262.git' + '@' + '238c88d4a084d9928372954e2fec54af2c951281',
+    Var('chromium_url') + '/external/github.com/tc39/test262.git' + '@' + '2726142bb97e4538703eda748c3b7300183bc66d',
   'v8/test/test262/harness':
     Var('chromium_url') + '/external/github.com/test262-utils/test262-harness-py.git' + '@' + '0f2acdd882c84cff43b9d60df7574a1901e2cdcd',
   'v8/third_party/qemu-linux-x64': {