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

lib/crypto/hash_utils.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.
 
 // Constants.
 final _MASK_8 = 0xff;
 final _MASK_32 = 0xffffffff;
 final _BITS_PER_BYTE = 8;
 final _BYTES_PER_WORD = 4;
 
@@ skipping 114 matching lines @@
   _finalizeData() {
     _pendingData.add(0x80);
     var contentsLength = _lengthInBytes + 9;
     var chunkSizeInBytes = _chunkSizeInWords * _BYTES_PER_WORD;
     var finalizedLength = _roundUp(contentsLength, chunkSizeInBytes);
     var zeroPadding = finalizedLength - contentsLength;
     for (var i = 0; i < zeroPadding; i++) {
       _pendingData.add(0);
     }
     var lengthInBits = _lengthInBytes * _BITS_PER_BYTE;
-    assert(lengthInBits < Math.pow(2, 32));
+    assert(lengthInBits < pow(2, 32));
     if (_bigEndianWords) {
       _pendingData.addAll(_wordToBytes(0));
       _pendingData.addAll(_wordToBytes(lengthInBits & _MASK_32));
     } else {
       _pendingData.addAll(_wordToBytes(lengthInBits & _MASK_32));
       _pendingData.addAll(_wordToBytes(0));
     }
   }
 
   // Hasher state.
   final int _chunkSizeInWords;
   final int _digestSizeInWords;
   final bool _bigEndianWords;
   int _lengthInBytes = 0;
   List<int> _pendingData;
   List<int> _currentChunk;
   List<int> _h;
   bool _digestCalled = false;
 }