Issue 28580. Relax instantiate to bounds.

pkg/analyzer/lib/src/task/dart.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 analyzer.src.task.dart;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 5665 matching lines @@
     //
     LibraryElement library = getRequiredInput(LIBRARY_INPUT);
     CompilationUnit unit = getRequiredInput(UNIT_INPUT);
     CompilationUnitElement unitElement = unit.element;
     TypeProvider typeProvider = getRequiredInput(TYPE_PROVIDER_INPUT);
     //
     // Resolve TypeName nodes.
     //
     RecordingErrorListener errorListener = new RecordingErrorListener();
     new TypeParameterBoundsResolver(
-            typeProvider, library, unitElement.source, errorListener)
+            context.typeSystem, library, unitElement.source, errorListener)
         .resolveTypeBounds(unit);
     //
     // Record outputs.
     //
     outputs[RESOLVE_TYPE_BOUNDS_ERRORS] =
         getTargetSourceErrors(errorListener, target);
     outputs[RESOLVED_UNIT4] = unit;
     outputs[CREATED_RESOLVED_UNIT4] = true;
   }
 
@@ skipping 890 matching lines @@
 
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.removeLast();
     return true;
   }
 }