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

runtime/bin/filter_patch.dart

Index: runtime/bin/filter_patch.dart
diff --git a/runtime/bin/filter_patch.dart b/runtime/bin/filter_patch.dart
index d8109fda5effbd7ecf04601e98ad241c9bb7ee2f..3a321703b62045bb99d2ef8ee17f2c098c001089 100644
--- a/runtime/bin/filter_patch.dart
+++ b/runtime/bin/filter_patch.dart
@@ -31,15 +31,15 @@ class _ZLibDeflateFilter extends _FilterImpl {
 }
 
 patch class _Filter {
-  /* patch */ static _Filter newZLibDeflateFilter(bool gzip, int level,
-                                                  int windowBits, int memLevel,
-                                                  int strategy,
-                                                  List<int> dictionary,
-                                                  bool raw) =>
+  /* patch */ static _Filter _newZLibDeflateFilter(bool gzip, int level,
+                                                   int windowBits, int memLevel,
+                                                   int strategy,
+                                                   List<int> dictionary,
+                                                   bool raw) =>
       new _ZLibDeflateFilter(gzip, level, windowBits, memLevel, strategy,
                              dictionary, raw);
-  /* patch */ static _Filter newZLibInflateFilter(int windowBits,
-                                                  List<int> dictionary,
-                                                  bool raw) =>
+  /* patch */ static _Filter _newZLibInflateFilter(int windowBits,
+                                                   List<int> dictionary,
+                                                   bool raw) =>
       new _ZLibInflateFilter(windowBits, dictionary, raw);
 }