Format all dart: library files

sdk/lib/io/string_transformer.dart

Index: sdk/lib/io/string_transformer.dart
diff --git a/sdk/lib/io/string_transformer.dart b/sdk/lib/io/string_transformer.dart
index 1e540c35a234981114ab94f19113f3b0e289c041..08b08bbb7c331baeb4c366573e36e8b0bd79fc44 100644
--- a/sdk/lib/io/string_transformer.dart
+++ b/sdk/lib/io/string_transformer.dart
@@ -44,7 +44,6 @@ class SystemEncoding extends Encoding {
 
 class _WindowsCodePageEncoder extends Converter<String, List<int>>
     implements ChunkedConverter<String, List<int>, String, List<int>> {
-
   const _WindowsCodePageEncoder();
 
   List<int> convert(String input) {
@@ -94,10 +93,8 @@ class _WindowsCodePageEncoderSink extends StringConversionSinkBase {
   }
 }
 
-
 class _WindowsCodePageDecoder extends Converter<List<int>, String>
     implements ChunkedConverter<List<int>, String, List<int>, String> {
-
   const _WindowsCodePageDecoder();
 
   String convert(List<int> input) {