Remove the old task model

pkg/analyzer/test/src/context/cache_test.dart

 // Copyright (c) 2015, 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.src.task.driver_test;
 
 import 'package:analyzer/src/context/cache.dart';
-import 'package:analyzer/src/generated/engine.dart'
-    show
-        AnalysisContext,
-        CacheState,
-        InternalAnalysisContext,
-        RetentionPriority;
+import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_collection.dart';
 import 'package:analyzer/src/task/model.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:typed_mock/typed_mock.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../generated/test_support.dart';
 import '../../reflective_tests.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
   runReflectiveTests(AnalysisCacheTest);
   runReflectiveTests(CacheEntryTest);
   runReflectiveTests(CacheFlushManagerTest);
   runReflectiveTests(SdkCachePartitionTest);
   runReflectiveTests(UniversalCachePartitionTest);
   runReflectiveTests(ResultDataTest);
 }
 
-AnalysisCache createCache(
-    {AnalysisContext context,
-    RetentionPriority policy: RetentionPriority.LOW}) {
+AnalysisCache createCache({AnalysisContext context}) {
   CachePartition partition = new UniversalCachePartition(context);
   return new AnalysisCache(<CachePartition>[partition]);
 }
 
 class AbstractCacheTest {
   InternalAnalysisContext context;
   AnalysisCache cache;
 
   void setUp() {
     context = new _InternalAnalysisContextMock();
@@ skipping 1091 matching lines @@
       return DeltaResult.KEEP_CONTINUE;
     }
     return DeltaResult.INVALIDATE;
   }
 }
 
 class _TestAnalysisTarget implements AnalysisTarget {
   @override
   Source get source => null;
 }