Eliminate deprecated Int32/Int64.fromInt() constructors

pkg/fixnum/lib/src/int32.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.
 
 part of fixnum;
 
 /**
  * An immutable 32-bit signed integer, in the range [-2^31, 2^31 - 1].
  * Arithmetic operations may overflow in order to maintain this range.
  */
@@ skipping 120 matching lines @@
   final int _i;
 
   const Int32._internal(int i) : _i = i;
 
   /**
    * Constructs an [Int32] from an [int].  Only the low 32 bits of the input
    * are used.
    */
   Int32([int i=0]) : _i = (i & 0x7fffffff) - (i & 0x80000000);
 
-  /**
-   * Constructs an [Int32] from an [int].  Only the low 32 bits of the input
-   * are used.
-   */
-  @deprecated
-  Int32.fromInt(int i) : this(i);
-
   // Returns the [int] representation of the specified value. Throws
   // [ArgumentError] for non-integer arguments.
   int _toInt(val) {
     if (val is Int32) {
       return val._i;
     } else if (val is int) {
       return val;
     }
     throw new ArgumentError(val);
   }
@@ skipping 217 matching lines @@
 
   double toDouble() => _i.toDouble();
   int toInt() => _i;
   Int32 toInt32() => this;
   Int64 toInt64() => new Int64(_i);
 
   String toString() => _i.toString();
   String toHexString() => _i.toRadixString(16);
   String toRadixString(int radix) => _i.toRadixString(radix);
 }