Mark all private functions in dart: libraries as invisible (*sniff*).

tests/lib/mirrors/invocation_fuzz_test.dart

Index: tests/lib/mirrors/invocation_fuzz_test.dart
diff --git a/tests/lib/mirrors/invocation_fuzz_test.dart b/tests/lib/mirrors/invocation_fuzz_test.dart
index 404353a7db61be3000b9022f5cc9b196a7cf2480..6ff924238eff876e934fa4eb9925ba5db7b6f391 100644
--- a/tests/lib/mirrors/invocation_fuzz_test.dart
+++ b/tests/lib/mirrors/invocation_fuzz_test.dart
@@ -29,26 +29,9 @@ var blacklist = [
   // These prevent the test from exiting.
   'dart.io.sleep',
   'dart.io.HttpServer.HttpServer.listenOn',
-  new RegExp('dart\.io\..*'),  /// smi: ok
-  new RegExp('dart\.io\._Timer\..*'),
-  new RegExp('dart\.isolate\..*'),
-
-  // Runtime exceptions we can't catch because they occur too early in event
-  // dispatch to be caught in a zone.
-  'dart.io._Timer._createTimer',  /// smi: ok
-  'dart.async.runZoned',  /// string: ok
-  '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._IOService._initialize',
-  'dart.io._IOService._finalize',
-  '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
 ];