Remove the LineTransformer from dart:io

tools/coverage.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.
 
 // This test forks a second vm process that runs a dart script as
 // a debug target, single stepping through the entire program, and
 // recording each breakpoint. At the end, a coverage map of the source
 // is printed.
 //
 // Usage: dart coverage.dart [--wire] [--verbose] target_script.dart
 //
 //   --wire      see json messages sent between the processes.
 //   --verbose   see the stdout and stderr output of the debug
 //               target process.
 
+import "dart:convert";
 import "dart:io";
 import "dart:utf";
 import "dart:json" as JSON;
 
 
 // Whether or not to print debug target process on the console.
 var showDebuggeeOutput = false;
 
 // Whether or not to print the debugger wire messages on the console.
 var verboseWire = false;
@@ skipping 181 matching lines @@
   int isolateId = 0;
   int libraryId = null;
 
   int nextMessageId = 0;
   bool isPaused = false;
   bool pendingAck = false;
 
   Debugger(this.targetProcess) {
     var stdoutStringStream = targetProcess.stdout
         .transform(new StringDecoder())
-        .transform(new LineTransformer());
+        .transform(new LineSplitter());
     stdoutStringStream.listen((line) {
       if (showDebuggeeOutput) {
         print("TARG: $line");
       }
       if (line.startsWith("Debugger listening")) {
         RegExp portExpr = new RegExp(r"\d+");
         var port = portExpr.stringMatch(line);
         var pid = targetProcess.pid;
         print("Coverage target process (pid $pid) found "
               "listening on port $port.");
         openConnection(int.parse(port));
       }
     });
 
     var stderrStringStream = targetProcess.stderr
         .transform(new StringDecoder())
-        .transform(new LineTransformer());
+        .transform(new LineSplitter());
     stderrStringStream.listen((line) {
       if (showDebuggeeOutput) {
         print("TARG: $line");
       }
     });
   }
 
   // Handle debugger events, updating the debugger state.
   void handleEvent(Map<String,dynamic> msg) {
     if (msg["event"] == "isolate") {
@@ skipping 294 matching lines @@
         targetOpts.add(str);
         break;
     }
   }
 
   Process.start(options.executable, targetOpts).then((Process process) {
     process.stdin.close();
     debugger = new Debugger(process);
   });
 }