Revert "Steps towards making the convert library strong-mode compliant."

sdk/lib/convert/line_splitter.dart

Index: sdk/lib/convert/line_splitter.dart
diff --git a/sdk/lib/convert/line_splitter.dart b/sdk/lib/convert/line_splitter.dart
index a9c94488a6c366e35d8650785403ef71338aac88..b9023f4c8fb246bfa235ef8c9e20ffa8120ac9c1 100644
--- a/sdk/lib/convert/line_splitter.dart
+++ b/sdk/lib/convert/line_splitter.dart
@@ -17,8 +17,7 @@ const int _CR = 13;
  *
  * The returned lines do not contain the line terminators.
  */
-class LineSplitter extends
-    ChunkedConverter<String, List<String>, String, String> {
+class LineSplitter extends Converter<String, List<String>> {
 
   const LineSplitter();
 
@@ -80,6 +79,9 @@ class LineSplitter extends
     }
     return new _LineSplitterSink(sink);
   }
+
+  // Override the base-class' bind, to provide a better type.
+  Stream<String> bind(Stream<String> stream) => super.bind(stream);
 }
 
 // TODO(floitsch): deal with utf8.