Change RangeError instances to use RangeError.range.

sdk/lib/convert/encoding.dart

Index: sdk/lib/convert/encoding.dart
diff --git a/sdk/lib/convert/encoding.dart b/sdk/lib/convert/encoding.dart
index cc67f6f176c54eaa237cb733b37e105b99ba6ca1..696b5f0fcf750196d14ab8e61f117e428f8fe9cf 100644
--- a/sdk/lib/convert/encoding.dart
+++ b/sdk/lib/convert/encoding.dart
@@ -69,8 +69,8 @@ abstract class Encoding extends Codec<String, List<int>> {
   * If character set is not supported [:null:] is returned.
   */
   static Encoding getByName(String name) {
-      if (name == null) return null;
-      name = name.toLowerCase();
-      return _nameToEncoding[name];
+    if (name == null) return null;
+    name = name.toLowerCase();
+    return _nameToEncoding[name];
   }
 }