[Ignition] Remove outdated test expectation.

BUG=v8:4680
LOG=n
NOTRY=true
TBR=rmcilroy@chromium.org
NOTREECHECKS=true
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1778323002

Cr-Commit-Position: refs/heads/master@{#34659}

test/test262/test262.status

@@ -609,9 +609,6 @@
   'language/statements/generators/yield-as-yield-operand': [FAIL],
   'language/statements/generators/yield-newline': [FAIL],
   'language/statements/generators/yield-star-before-newline': [FAIL],
-
-  # TODO(4680,rmcilroy): Test262Error: Expected a RangeError to be thrown but no exception was thrown at all
-  'built-ins/Date/prototype/toISOString/15.9.5.43-0-13': [FAIL],
 }],  # ignition == True
 
 ]