Remove the LineTransformer from dart:io

tests/standalone/debugger/debug_lib.dart

Index: tests/standalone/debugger/debug_lib.dart
diff --git a/tests/standalone/debugger/debug_lib.dart b/tests/standalone/debugger/debug_lib.dart
index 79161c7d5dc43e9668e56f05edf4dd59f9395315..7be6854ee083d58516030e5f180af41b396c979d 100644
--- a/tests/standalone/debugger/debug_lib.dart
+++ b/tests/standalone/debugger/debug_lib.dart
@@ -7,6 +7,7 @@
 library DartDebugger;
 
 import "dart:async";
+import "dart:convert";
 import "dart:io";
 import "dart:math";
 import "dart:utf";
@@ -393,7 +394,7 @@ class Debugger {
   Debugger(this.targetProcess, this.script) {
     var stdoutStringStream = targetProcess.stdout
         .transform(new StringDecoder())
-        .transform(new LineTransformer());
+        .transform(new LineSplitter());
     stdoutStringStream.listen((line) {
       print("TARG: $line");
       if (line.startsWith("Debugger listening")) {
@@ -406,7 +407,7 @@ class Debugger {
 
     var stderrStringStream = targetProcess.stderr
         .transform(new StringDecoder())
-        .transform(new LineTransformer());
+        .transform(new LineSplitter());
     stderrStringStream.listen((line) {
       print("TARG: $line");
     });