Update webkit test expectations for sloppy functions in case

A recent ES2015 semantics web compatibility fix changed a WebKit
test from a syntax error to a known failure without a syntax
error. This confused the fuzzer infrastructure. This patch updates
the test expectations to the expected output, based on what the
new semantics provide.

R=machenbach,adamk
BUG=v8:4693
LOG=N

Review URL: https://codereview.chromium.org/1628013003

Cr-Commit-Position: refs/heads/master@{#33484}

test/webkit/function-declarations-in-switch-statement-expected.txt

@@ -26,7 +26,7 @@ PASS 20 is 20
 WARN: shouldBe() expects string arguments
 PASS 20 is 20
 WARN: shouldBe() expects string arguments
-PASS 20 is 20
+FAIL -1 should be 20. Was -1.
 PASS successfullyParsed is true
 
 TEST COMPLETE

test/webkit/webkit.status

@@ -35,9 +35,6 @@
   'dfg-inline-arguments-reset-changetype': [PASS, FAIL],
   # TODO(turbofan): We run out of stack earlier on 64-bit for now.
   'fast/js/deep-recursion-test': [PASS, NO_VARIANTS],
-  # This test leads to a SyntaxError from conflicting let declarations
-  # in ES2015
-  'function-declarations-in-switch-statement': [FAIL],
   # Irregexp interpreter overflows stack. We should just not crash.
   'fast/js/regexp-stack-overflow': [PASS, FAIL],
 }],  # ALWAYS