Some more removals of dart:utf.

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.
 class JsonBuffer {
   String buffer = null;
 
@@ skipping 592 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;
 }