Eliminate unused matcher_util in flutter_driver (#13159)

Use of this file was eliminated in e7657b94.

packages/flutter_driver/lib/src/matcher_util.dart

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:matcher/matcher.dart';
-
-/// Matches [value] against the [matcher].
-MatchResult match(dynamic value, Matcher matcher) {
-  final Map<dynamic, dynamic> matchState = <dynamic, dynamic>{};
-  if (matcher.matches(value, matchState)) {
-    return new MatchResult._matched();
-  } else {
-    final Description description = matcher.describeMismatch(
-      value, new _TextDescription(), matchState, false,
-    );
-    return new MatchResult._mismatched(description.toString());
-  }
-}
-
-/// Result of matching a value against a matcher.
-class MatchResult {
-  MatchResult._matched()
-    : hasMatched = true,
-      mismatchDescription = null;
-
-  MatchResult._mismatched(this.mismatchDescription)
-    : hasMatched = false;
-
-  /// Whether the match succeeded.
-  final bool hasMatched;
-
-  /// If the match did not succeed, this field contains the explanation.
-  final String mismatchDescription;
-}
-
-/// Writes description into a string.
-class _TextDescription implements Description {
-  final StringBuffer _text = new StringBuffer();
-
-  @override
-  int get length => _text.length;
-
-  @override
-  Description add(String text) {
-    _text.write(text);
-    return this;
-  }
-
-  @override
-  Description replace(String text) {
-    _text.clear();
-    _text.write(text);
-    return this;
-  }
-
-  @override
-  Description addDescriptionOf(dynamic value) {
-    if (value is Matcher) {
-      value.describe(this);
-      return this;
-    } else {
-      return add('$value');
-    }
-  }
-
-  @override
-  Description addAll(String start, String separator, String end, Iterable<dynamic> list) {
-    add(start);
-    if (list.isNotEmpty) {
-      addDescriptionOf(list.first);
-      for (dynamic item in list.skip(1)) {
-        add(separator);
-        addDescriptionOf(item);
-      }
-    }
-    add(end);
-    return this;
-  }
-
-  @override
-  String toString() => '$_text';
-}

packages/flutter_driver/pubspec.yaml

@@ -10,7 +10,6 @@ environment:
 dependencies:
   file: 2.3.4
   json_rpc_2: 2.0.4
-  matcher: 0.12.1+4
   meta: 1.1.1
   path: 1.4.2
   web_socket_channel: 1.0.6
@@ -40,6 +39,7 @@ dev_dependencies:
   intl: 0.15.2 # TRANSITIVE DEPENDENCY
   io: 0.3.0 # TRANSITIVE DEPENDENCY
   js: 0.6.1 # TRANSITIVE DEPENDENCY
+  matcher: 0.12.1+4 # TRANSITIVE DEPENDENCY
   mime: 0.9.4 # TRANSITIVE DEPENDENCY
   node_preamble: 1.4.0 # TRANSITIVE DEPENDENCY
   package_config: 1.0.3 # TRANSITIVE DEPENDENCY

packages/flutter_driver/test/src/matcher_util_test.dart

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:test/test.dart';
-import 'package:flutter_driver/src/matcher_util.dart';
-
-void main() {
-  group('match', () {
-    test('matches', () {
-      final _TestMatcher matcher = new _TestMatcher(1);
-      final MatchResult ok = match(1, matcher);
-      expect(ok.hasMatched, isTrue);
-      expect(ok.mismatchDescription, isNull);
-      expect(matcher.matchState1 is Map<dynamic, dynamic>, isTrue);
-      expect(matcher.matchState2, isNull);
-    });
-
-    test('mismatches', () {
-      final _TestMatcher matcher = new _TestMatcher(2);
-      final MatchResult fail = match(1, matcher);
-      expect(fail.hasMatched, isFalse);
-      expect(fail.mismatchDescription, 'mismatch!');
-      expect(matcher.matchState1, matcher.matchState2);
-    });
-  });
-}
-
-class _TestMatcher extends Matcher {
-  int expected;
-  Map<dynamic, dynamic> matchState1;
-  Map<dynamic, dynamic> matchState2;
-
-  _TestMatcher(this.expected);
-
-  @override
-  bool matches(dynamic item, Map<dynamic, dynamic> matchState) {
-    matchState1 = matchState;
-    return item == expected;
-  }
-
-  @override
-  Description describeMismatch(dynamic item, Description mismatchDescription, Map<dynamic, dynamic> matchState, bool verbose) {
-    matchState2 = matchState;
-    mismatchDescription.add('mismatch!');
-    return mismatchDescription;
-  }
-
-  @override
-  Description describe(Description description) {
-    throw 'not implemented';
-  }
-}