Remove the LineTransformer from dart:io

tests/standalone/debugger/debug_lib.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Library used by debugger wire protocol tests (standalone VM debugging).
 
 library DartDebugger;
 
 import "dart:async";
+import "dart:convert";
 import "dart:io";
 import "dart:math";
 import "dart:utf";
 import "dart:json" as JSON;
 
 // Whether or not to print the debugger wire messages on the console.
 var verboseWire = false;
 
 // Class to buffer wire protocol data from debug target and
 // break it down to individual json messages.
@@ skipping 366 matching lines @@
   // Data collected from debug target.
   Map currentMessage = null;  // Currently handled message sent by target.
   String scriptUrl = null;
   bool shutdownEventSeen = false;
   int isolateId = 0;
   bool isPaused = false;
 
   Debugger(this.targetProcess, this.script) {
     var stdoutStringStream = targetProcess.stdout
         .transform(new StringDecoder())
-        .transform(new LineTransformer());
+        .transform(new LineSplitter());
     stdoutStringStream.listen((line) {
       print("TARG: $line");
       if (line.startsWith("Debugger listening")) {
         RegExp portExpr = new RegExp(r"\d+");
         var port = portExpr.stringMatch(line);
         print("Debug target found listening at port '$port'");
         openConnection(int.parse(port));
       }
     });
 
     var stderrStringStream = targetProcess.stderr
         .transform(new StringDecoder())
-        .transform(new LineTransformer());
+        .transform(new LineSplitter());
     stderrStringStream.listen((line) {
       print("TARG: $line");
     });
   }
 
   // Handle debugger events, updating the debugger state.
   void handleEvent(Map<String,dynamic> msg) {
     events.add(new Event(msg));
     
     if (msg["event"] == "isolate") {
@@ skipping 195 matching lines @@
   targetOpts.add("--debuggee");
   print('args: ${targetOpts.join(" ")}');
 
   Process.start(Platform.executable, targetOpts).then((Process process) {
     print("Debug target process started, pid ${process.pid}.");
     process.stdin.close();
     var debugger = new Debugger(process, new DebugScript(script));
   });
   return true;
 }