path: Fix some analyzer hints.

lib/src/style/url.dart

 // Copyright (c) 2013, 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.
 
 library path.style.url;
 
 import '../characters.dart' as chars;
 import '../internal_style.dart';
-import '../utils.dart';
 
 /// The style for URL paths.
 class UrlStyle extends InternalStyle {
   UrlStyle();
 
   final name = 'url';
   final separator = '/';
   final separators = const ['/'];
 
   // Deprecated properties.
@@ skipping 36 matching lines @@
   bool isRootRelative(String path) =>
       path.isNotEmpty && isSeparator(path.codeUnitAt(0));
 
   String getRelativeRoot(String path) => isRootRelative(path) ? '/' : null;
 
   String pathFromUri(Uri uri) => uri.toString();
 
   Uri relativePathToUri(String path) => Uri.parse(path);
   Uri absolutePathToUri(String path) => Uri.parse(path);
 }