Get rid of some unused "hide" declarations.

lib/src/frontend/prints_matcher.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.
 
 library test.frontend.prints_matcher;
 
 import 'dart:async';
 
-import 'package:matcher/matcher.dart' hide completes, expect;
+import 'package:matcher/matcher.dart';
 
 import 'expect.dart';
 import 'future_matchers.dart';
 
 /// Matches a [Function] that prints text that matches [matcher].
 ///
 /// [matcher] may be a String or a [Matcher].
 ///
 /// If the function this runs against returns a [Future], all text printed by
 /// the function (using [Zone] scoping) until that Future completes is matched.
@@ skipping 52 matching lines @@
         .describeMismatch(actual, new StringDescription(), matchState, verbose)
         .toString();
 
     if (innerMismatch.isNotEmpty) {
       description.add('\n   Which: ').add(innerMismatch.toString());
     }
 
     return description;
   }
 }