Deprecate Math object in corelib in favor of dart:math library.

tools/ddbg.dart

 // Copyright (c) 2012, 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.
 
 // Simple interactive debugger shell that connects to the Dart VM's debugger
 // connection port.
 
 #import("dart:io");
 #import("dart:json");
+#import("dart:math", prefix: "Math");
 #import("dart:utf");
 
 
 Map<int, Completer> outstandingCommands;
 
 Socket vmSock;
 String vmData;
 OutputStream vmStream;
 int seqNum = 0;
 
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   };
   vmInStream.onError = (err) {
     print("Error in debug connection: $err");
     quitShell();
   };
   vmInStream.onClosed = () {
     print("VM debugger connection closed");
     quitShell();
   };
 }