Reland "Test262 roll"

Reland patch originally reviewed at https://codereview.chromium.org/1268553003/

This new patch marks a test [PASS, FAIL] since it passes on some platforms.

Review URL: https://codereview.chromium.org/1273883005

Cr-Commit-Position: refs/heads/master@{#30072}

test/test262-es6/testcfg.py

@@ -39,8 +39,8 @@ from testrunner.local import utils
 from testrunner.objects import testcase
 
 # The revision hash needs to be 7 characters?
-TEST_262_ARCHIVE_REVISION = "c6ac390"  # This is the 2015-07-06 revision.
-TEST_262_ARCHIVE_MD5 = "e1393ef330f38e9cb1bfa4e3eada5ba8"
+TEST_262_ARCHIVE_REVISION = "258d212"  # This is the 2015-07-31 revision.
+TEST_262_ARCHIVE_MD5 = "a9b26e19ce582492642af973c8cee826"
 TEST_262_URL = "https://github.com/tc39/test262/tarball/%s"
 TEST_262_HARNESS_FILES = ["sta.js", "assert.js"]