Remove unused contentHash from results

pkg/analyzer/test/src/dart/analysis/driver_test.dart

Index: pkg/analyzer/test/src/dart/analysis/driver_test.dart
diff --git a/pkg/analyzer/test/src/dart/analysis/driver_test.dart b/pkg/analyzer/test/src/dart/analysis/driver_test.dart
index 1205de09e9bce5a2d5a84c770ca1e7d2270f6a9e..8985c013873e4675cfc84b166d86a00cc40a8f39 100644
--- a/pkg/analyzer/test/src/dart/analysis/driver_test.dart
+++ b/pkg/analyzer/test/src/dart/analysis/driver_test.dart
@@ -2,10 +2,7 @@
 // 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 analyzer.test.driver;
-
 import 'dart:async';
-import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ -27,8 +24,6 @@ import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
-import 'package:convert/convert.dart';
-import 'package:crypto/crypto.dart';
 import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/incremental/byte_store.dart';
 import 'package:test/test.dart';
@@ -1094,7 +1089,6 @@ bbb() {}
     ErrorsResult result = await driver.getErrors(testFile);
     expect(result.path, testFile);
     expect(result.uri.toString(), 'package:test/test.dart');
-    expect(result.contentHash, _md5(content));
     expect(result.errors, hasLength(1));
   }
 
@@ -1238,7 +1232,6 @@ class Test {}
     expect(result.uri.toString(), 'package:test/test.dart');
     expect(result.exists, isTrue);
     expect(result.content, content);
-    expect(result.contentHash, _md5(content));
     expect(result.unit, isNotNull);
     expect(result.errors, hasLength(0));
 
@@ -2498,7 +2491,6 @@ class F extends X {}
     expect(result.path, testFile);
     expect(result.uri.toString(), 'package:test/test.dart');
     expect(result.content, content);
-    expect(result.contentHash, _md5(content));
     expect(result.unit, isNotNull);
     expect(result.errors, hasLength(0));
 
@@ -2538,7 +2530,6 @@ class F extends X {}
     expect(result.path, testFile);
     expect(result.uri.toString(), 'package:test/test.dart');
     expect(result.content, isNull);
-    expect(result.contentHash, _md5(content));
     expect(result.unit, isNull);
     expect(result.errors, hasLength(0));
   }
@@ -2708,10 +2699,6 @@ class F extends X {}
    * Return the [provider] specific path for the given Posix [path].
    */
   String _p(String path) => provider.convertPath(path);
-
-  static String _md5(String content) {
-    return hex.encode(md5.convert(UTF8.encode(content)).bytes);
-  }
 }
 
 @reflectiveTest