Support use of dill in TypeEnv tests

tests/compiler/dart2js/world_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 world_test;
 
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'type_test_helper.dart';
 import 'package:compiler/src/common/names.dart';
@@ skipping 29 matching lines @@
         new A();
         new B();
         new C();
         new D();
         new E();
         new F();
         new G();
         html.window;
         new html.Worker('');
       }
-      """, useMockCompiler: false);
+      """, compileMode: CompileMode.memory);
   ClosedWorld closedWorld = env.closedWorld;
 
   ClassElement Object_ = env.getElement("Object");
   ClassElement A = env.getElement("A");
   ClassElement B = env.getElement("B");
   ClassElement C = env.getElement("C");
   ClassElement D = env.getElement("D");
   ClassElement E = env.getElement("E");
   ClassElement F = env.getElement("F");
   ClassElement G = env.getElement("G");
@@ skipping 165 matching lines @@
         new B();
         new C1();
         new D2();
         new E3();
         new F1();
         new F2();
         new G2();
         new G3();
         new H4();
       }
-      """, useMockCompiler: false);
+      """, compileMode: CompileMode.memory);
   ClosedWorld closedWorld = env.closedWorld;
 
   check(String name, {bool hasStrictSubtype, bool hasOnlySubclasses}) {
     ClassElement cls = env.getElement(name);
     Expect.equals(hasStrictSubtype, closedWorld.hasAnyStrictSubtype(cls),
         "Unexpected hasAnyStrictSubtype property on $cls.");
     Expect.equals(hasOnlySubclasses, closedWorld.hasOnlySubclasses(cls),
         "Unexpected hasOnlySubclasses property on $cls.");
   }
 
@@ skipping 56 matching lines @@
   var env = await TypeEnvironment.create('',
       mainSource: r"""
       import 'dart:html' as html;
       main() {
         html.window; // Creates 'Window'.
         new html.Worker(''); // Creates 'Worker'.
         new html.CanvasElement() // Creates CanvasElement
             ..getContext(''); // Creates CanvasRenderingContext2D
       }
       """,
-      useMockCompiler: false);
+      compileMode: CompileMode.memory);
   ClosedWorld closedWorld = env.closedWorld;
   LibraryElement dart_html =
       env.compiler.libraryLoader.lookupLibrary(Uris.dart_html);
 
   ClassElement clsEventTarget = dart_html.findExported('EventTarget');
   ClassElement clsWindow = dart_html.findExported('Window');
   ClassElement clsAbstractWorker = dart_html.findExported('AbstractWorker');
   ClassElement clsWorker = dart_html.findExported('Worker');
   ClassElement clsCanvasElement = dart_html.findExported('CanvasElement');
   ClassElement clsCanvasRenderingContext =
@@ skipping 201 matching lines @@
         new C();
         new D();
         new E();
         new F();
         new G();
         new H();
         new I();
         new J();
       }
       """,
-      useMockCompiler: false);
+      compileMode: CompileMode.memory);
   ClosedWorld closedWorld = env.closedWorld;
 
   ClassElement A = env.getElement("A");
   ClassElement B = env.getElement("B");
   ClassElement C = env.getElement("C");
   ClassElement D = env.getElement("D");
   ClassElement F = env.getElement("F");
   ClassElement G = env.getElement("G");
   ClassElement H = env.getElement("H");
   ClassElement I = env.getElement("I");
@@ skipping 47 matching lines @@
   check(B, ClassQuery.EXACT, C, ClassQuery.EXACT, []);
   check(B, ClassQuery.EXACT, C, ClassQuery.SUBCLASS, []);
   check(B, ClassQuery.SUBCLASS, C, ClassQuery.EXACT, []);
   check(B, ClassQuery.EXACT, C, ClassQuery.SUBTYPE, []);
   check(B, ClassQuery.SUBTYPE, C, ClassQuery.EXACT, []);
   check(B, ClassQuery.SUBCLASS, C, ClassQuery.SUBCLASS, []);
   check(B, ClassQuery.SUBCLASS, C, ClassQuery.SUBTYPE, []);
   check(B, ClassQuery.SUBTYPE, C, ClassQuery.SUBCLASS, [G]);
   check(B, ClassQuery.SUBTYPE, C, ClassQuery.SUBTYPE, [F, G]);
 }