Removed fixed dependencies

packages/usage/lib/src/uuid.dart

 // Copyright (c) 2014, 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.
 
-/// A UUID generator library.
-library uuid;
+/**
+ * A UUID generator library.
+ */
+library usage.uuid;
 
 import 'dart:math' show Random;
 
-/// A UUID generator.
-///
-/// This will generate unique IDs in the format:
-///
-///     f47ac10b-58cc-4372-a567-0e02b2c3d479
-///
-/// The generated uuids are 128 bit numbers encoded in a specific string format.
-/// For more information, see
-/// [en.wikipedia.org/wiki/Universally_unique_identifier](http://en.wikipedia.org/wiki/Universally_unique_identifier).
+/**
+ * A UUID generator. This will generate unique IDs in the format:
+ *
+ *     f47ac10b-58cc-4372-a567-0e02b2c3d479
+ *
+ * The generated uuids are 128 bit numbers encoded in a specific string format.
+ *
+ * For more information, see
+ * http://en.wikipedia.org/wiki/Universally_unique_identifier.
+ */
 class Uuid {
-  final Random _random = new Random();
+  Random _random = new Random();
 
-  /// Generate a version 4 (random) uuid. This is a uuid scheme that only uses
-  /// random numbers as the source of the generated uuid.
+  /**
+   * Generate a version 4 (random) uuid. This is a uuid scheme that only uses
+   * random numbers as the source of the generated uuid.
+   */
   String generateV4() {
     // Generate xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx / 8-4-4-4-12.
     int special = 8 + _random.nextInt(4);
 
-    return '${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}-'
+    return
+        '${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}-'
         '${_bitsDigits(16, 4)}-'
         '4${_bitsDigits(12, 3)}-'
         '${_printDigits(special,  1)}${_bitsDigits(12, 3)}-'
         '${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}';
   }
 
   String _bitsDigits(int bitCount, int digitCount) =>
       _printDigits(_generateBits(bitCount), digitCount);
 
   int _generateBits(int bitCount) => _random.nextInt(1 << bitCount);
 
   String _printDigits(int value, int count) =>
       value.toRadixString(16).padLeft(count, '0');
 }