Remove Compiler.mainApp and Compiler.mainFunction

tests/compiler/dart2js/no_such_method_enabled_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.
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/common_elements.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/js_backend/no_such_method_registry.dart';
@@ skipping 261 matching lines @@
       compiler.frontendStrategy.elementEnvironment;
   NoSuchMethodRegistry registry = compiler.backend.noSuchMethodRegistry;
   NoSuchMethodResolver resolver = registry.internalResolverForTesting;
   FunctionEntity ObjectNSM = elementEnvironment.lookupClassMember(
       compiler.frontendStrategy.commonElements.objectClass, 'noSuchMethod');
   ClosedWorld closedWorld =
       compiler.resolutionWorldBuilder.closedWorldForTesting;
 
   // Test [NoSuchMethodResolver] results for each method.
   for (NoSuchMethodInfo info in test.methods) {
-    ClassEntity cls =
-        elementEnvironment.lookupClass(compiler.mainApp, info.className);
+    ClassEntity cls = elementEnvironment.lookupClass(
+        elementEnvironment.mainLibrary, info.className);
     Expect.isNotNull(cls, "Class ${info.className} not found.");
     FunctionEntity noSuchMethod =
         elementEnvironment.lookupClassMember(cls, 'noSuchMethod');
     Expect.isNotNull(noSuchMethod, "noSuchMethod not found in $cls.");
 
     if (info.superClassName == null) {
       Expect.equals(ObjectNSM, resolver.getSuperNoSuchMethod(noSuchMethod));
     } else {
-      ClassEntity superclass =
-          elementEnvironment.lookupClass(compiler.mainApp, info.superClassName);
+      ClassEntity superclass = elementEnvironment.lookupClass(
+          elementEnvironment.mainLibrary, info.superClassName);
       Expect.isNotNull(
           superclass, "Superclass ${info.superClassName} not found.");
       FunctionEntity superNoSuchMethod =
           elementEnvironment.lookupClassMember(superclass, 'noSuchMethod');
       Expect.isNotNull(
           superNoSuchMethod, "noSuchMethod not found in $superclass.");
       Expect.equals(
           superNoSuchMethod,
           resolver.getSuperNoSuchMethod(noSuchMethod),
           "Unexpected super noSuchMethod for $noSuchMethod.");
     }
 
     Expect.equals(
         info.hasForwardingSyntax,
         resolver.hasForwardingSyntax(noSuchMethod),
         "Unexpected hasForwardSyntax result on $noSuchMethod.");
     Expect.equals(
         info.hasThrowingSyntax,
         resolver.hasThrowingSyntax(noSuchMethod),
         "Unexpected hasThrowingSyntax result on $noSuchMethod.");
   }
 
   // Test [NoSuchMethodRegistry] results for each method. These are based on
   // the [NoSuchMethodResolver] results which are therefore tested for all
   // methods first.
   for (NoSuchMethodInfo info in test.methods) {
-    ClassEntity cls =
-        elementEnvironment.lookupClass(compiler.mainApp, info.className);
+    ClassEntity cls = elementEnvironment.lookupClass(
+        elementEnvironment.mainLibrary, info.className);
     Expect.isNotNull(cls, "Class ${info.className} not found.");
     FunctionEntity noSuchMethod =
         elementEnvironment.lookupClassMember(cls, 'noSuchMethod');
     Expect.isNotNull(noSuchMethod, "noSuchMethod not found in $cls.");
 
     Expect.equals(info.isDefault, registry.defaultImpls.contains(noSuchMethod),
         "Unexpected isDefault result on $noSuchMethod.");
     Expect.equals(
         info.isThrowing,
         registry.throwingImpls.contains(noSuchMethod),
@@ skipping 14 matching lines @@
           registry.complexReturningImpls.contains(noSuchMethod),
           "Unexpected isComplexReturn result on $noSuchMethod.");
     }
   }
 
   Expect.equals(
       test.isNoSuchMethodUsed,
       closedWorld.backendUsage.isNoSuchMethodUsed,
       "Unexpected isNoSuchMethodUsed result.");
 }