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

runtime/bin/websocket_impl.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.
 
 final String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 class _WebSocketMessageType {
   static final int NONE = 0;
   static final int BINARY = 1;
   static final int TEXT = 2;
@@ skipping 709 matching lines @@
     }
 
     // Connection upgrade successful.
     DetachedSocket detached = _conn.detachSocket();
     _socketConnected(detached.socket);
     if (_onOpen != null) _onOpen();
     _startProcessing(detached.unparsedData);
   }
 
   void _generateNonceAndHash() {
+    Random random = new Random();
     assert(_nonce == null);
     void intToBigEndianBytes(int value, List<int> bytes, int offset) {
       bytes[offset] = (value >> 24) & 0xFF;
       bytes[offset + 1] = (value >> 16) & 0xFF;
       bytes[offset + 2] = (value >> 8) & 0xFF;
       bytes[offset + 3] = value & 0xFF;
     }
 
     // Generate 16 random bytes. Use the last four bytes for the hash code.
     List<int> nonce = new List<int>(16);
     for (int i = 0; i < 4; i++) {
-      int r = (Math.random() * 0x100000000).toInt();
+      int r = random.nextInt(0x100000000);
       intToBigEndianBytes(r, nonce, i * 4);
     }
     _nonce = _Base64._encode(nonce);
-    _hash = (Math.random() * 0x100000000).toInt();
+    _hash = random.nextInt(0x100000000);
   }
 
   bool _isWebSocketUpgrade(HttpClientResponse response) {
     if (response.headers[HttpHeaders.CONNECTION] == null) {
       return false;
     }
     bool isUpgrade = false;
     response.headers[HttpHeaders.CONNECTION].forEach((String value) {
       if (value.toLowerCase() == "upgrade") isUpgrade = true;
     });
@@ skipping 125 matching lines @@
 
 class _WebSocketCloseEvent implements CloseEvent {
   _WebSocketCloseEvent(this._wasClean, this._code, this._reason);
   bool get wasClean() => _wasClean;
   int get code() => _code;
   String get reason() => _reason;
   bool _wasClean;
   int _code;
   String _reason;
 }