Move super initializers to end of list

sdk/lib/convert/json.dart

Index: sdk/lib/convert/json.dart
diff --git a/sdk/lib/convert/json.dart b/sdk/lib/convert/json.dart
index 08eb79708b7208cf3b0f60c258dbbbbcb0206602..ace76c24c5f4f416c0f7149e9c85da5823335b41 100644
--- a/sdk/lib/convert/json.dart
+++ b/sdk/lib/convert/json.dart
@@ -903,9 +903,9 @@ class _JsonUtf8Stringifier extends _JsonStringifier {
   int index = 0;
 
   _JsonUtf8Stringifier(toEncodable, int bufferSize, this.addChunk)
-      : super(toEncodable),
-        this.bufferSize = bufferSize,
-        buffer = new Uint8List(bufferSize);
+      : this.bufferSize = bufferSize,
+        buffer = new Uint8List(bufferSize),
+        super(toEncodable);
 
   /**
    * Convert [object] to UTF-8 encoded JSON.