Re-blacklist SystemEncoding: still failing on Windows.

tests/lib/mirrors/invocation_fuzz_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This test reflectively enumerates all the methods in the system and tries to
 // invoke them will various basic values (nulls, ints, etc). This may result in
 // Dart exceptions or hangs, but should never result in crashes or JavaScript
 // exceptions.
 
 library test.invoke_natives;
@@ skipping 27 matching lines @@
   'dart.async._ScheduleImmediate._closure',
 
   // These either cause the VM to segfault or throw uncatchable API errors.
   // TODO(15274): Fix them and remove from blacklist.
   'dart.io._IOService.dispatch',
   'dart.io._StdIOUtils._socketType',
   'dart.io._StdIOUtils._getStdioOutputStream',
   'dart.io._Filter.newZLibInflateFilter',
   'dart.io._Filter.newZLibDeflateFilter',
   'dart.io._FileSystemWatcher._listenOnSocket',
+  'dart.io.SystemEncoding.decode',  // Windows only
+  'dart.io.SystemEncoding.encode',  // Windows only
 ];
 
 bool isBlacklisted(Symbol qualifiedSymbol) {
   var qualifiedString = MirrorSystem.getName(qualifiedSymbol);
   for (var pattern in blacklist) {
     if (qualifiedString.contains(pattern)) {
       print('Skipping $qualifiedString');
       return true;
     }
   }
@@ skipping 115 matching lines @@
      0, 0xEFFFFFF, 0xFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 3.14159,
      "foo", 'blåbærgrød', 'Îñţérñåţîöñåļîžåţîờñ', "𝄞", #symbol];
   valueObjects.forEach((v) => checkInstance(reflect(v), 'value object'));
 
   uncaughtErrorHandler(self, parent, zone, error, stack) {};
   var zoneSpec =
      new ZoneSpecification(handleUncaughtError: uncaughtErrorHandler);
   testZone = Zone.current.fork(specification: zoneSpec);
   testZone.createTimer(Duration.ZERO, doOneTask);
 }