Special-case top-level final JS fields.

tool/sdk_expected_errors.txt

Index: tool/sdk_expected_errors.txt
diff --git a/tool/sdk_expected_errors.txt b/tool/sdk_expected_errors.txt
index 994b444070e4a8009c65a9a4a00a41544de2fa97..42237337e152eb90fcc8b8a38e685bf6bf6331ec 100644
--- a/tool/sdk_expected_errors.txt
+++ b/tool/sdk_expected_errors.txt
@@ -1,12 +1,6 @@
 severe: [AnalyzerMessage] The redirected constructor '(dynamic) → JSArray<dynamic>' has incompatible parameters with '(dynamic) → JSArray<E>' (dart:_interceptors/js_array.dart, line 29, col 46)
 severe: [AnalyzerMessage] Missing concrete implementation of 'num.==' (dart:_interceptors/js_number.dart, line 12, col 7)
 severe: [AnalyzerMessage] Missing concrete implementation of 'String.==' (dart:_interceptors/js_string.dart, line 14, col 7)
-severe: [AnalyzerMessage] 'const' variables must be constant value (dart:_utils, line 15, col 24)
-severe: [AnalyzerMessage] 'const' variables must be constant value (dart:_utils, line 16, col 34)
-severe: [AnalyzerMessage] 'const' variables must be constant value (dart:_utils, line 17, col 29)
-severe: [AnalyzerMessage] 'const' variables must be constant value (dart:_utils, line 18, col 31)
-severe: [AnalyzerMessage] 'const' variables must be constant value (dart:_utils, line 20, col 24)
-severe: [AnalyzerMessage] 'const' variables must be constant value (dart:_utils, line 23, col 25)
 severe: [AnalyzerMessage] The redirected constructor '((Stream<dynamic>, bool) → StreamSubscription<dynamic>) → _StreamSubscriptionTransformer<dynamic, dynamic>' has incompatible parameters with '((Stream<S>, bool) → StreamSubscription<T>) → StreamTransformer<S, T>' (dart:async/stream.dart, line 1571, col 9)
 severe: [AnalyzerMessage] The redirected constructor '({handleData: (dynamic, EventSink<dynamic>) → void, handleError: (Object, StackTrace, EventSink<dynamic>) → void, handleDone: (EventSink<dynamic>) → void}) → _StreamHandlerTransformer<dynamic, dynamic>' has incompatible parameters with '({handleData: (S, EventSink<T>) → void, handleError: (Object, StackTrace, EventSink<T>) → void, handleDone: (EventSink<T>) → void}) → StreamTransformer<S, T>' (dart:async/stream.dart, line 1588, col 13)
 severe: [AnalyzerMessage] The type '_NoCallbackSyncStreamController' is declared with 0 type parameters, but 1 type arguments were given (dart:async/stream_controller.dart, line 84, col 17)