Remove Compiler.mainApp and Compiler.mainFunction

tests/compiler/dart2js/compiler_helper.dart

 // Copyright (c) 2012, 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 compiler_helper;
 
 import 'dart:async';
 import "package:expect/expect.dart";
 
 import 'package:compiler/compiler_new.dart';
 
+import 'package:compiler/src/common_elements.dart';
+
 import 'package:compiler/src/elements/elements.dart';
 export 'package:compiler/src/elements/elements.dart';
 
 import 'package:compiler/src/js_backend/js_backend.dart' as js;
 import 'package:compiler/src/js_backend/element_strategy.dart'
     show ElementCodegenWorkItem;
 
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common/codegen.dart';
 import 'package:compiler/src/common/resolution.dart';
@@ skipping 45 matching lines @@
         enableTypeAssertions: enableTypeAssertions,
         // Type inference does not run when manually
         // compiling a method.
         disableTypeInference: true,
         enableMinification: minify,
         disableInlining: disableInlining,
         trustJSInteropTypeAnnotations: trustJSInteropTypeAnnotations,
         outputProvider: outputCollector);
     await compiler.init();
     compiler.parseScript(code);
-    LibraryElement mainApp = compiler.mainApp;
-    MethodElement element = mainApp.find(entry);
+    ElementEnvironment elementEnvironment =
+        compiler.frontendStrategy.elementEnvironment;
+    MethodElement element = compiler.mainApp.find(entry);
     if (element == null) return null;
     compiler.phase = Compiler.PHASE_RESOLVING;
-    compiler.processQueue(
-        compiler.frontendStrategy.elementEnvironment,
-        compiler.enqueuer.resolution,
-        element,
-        compiler.libraryLoader.libraries);
+    compiler.processQueue(elementEnvironment, compiler.enqueuer.resolution,
+        element, compiler.libraryLoader.libraries);
     ResolutionWorkItem resolutionWork =
         new ResolutionWorkItem(compiler.resolution, element);
     resolutionWork.run();
-    ClosedWorld closedWorld = compiler.closeResolution().closedWorld;
+    ClosedWorld closedWorld = compiler.closeResolution(element).closedWorld;
     CodegenWorkItem work =
         new ElementCodegenWorkItem(compiler.backend, closedWorld, element);
     compiler.phase = Compiler.PHASE_COMPILING;
     work.run();
     js.JavaScriptBackend backend = compiler.backend;
     String generated = backend.getGeneratedCode(element);
     if (check != null) {
       check(generated);
     }
     return returnAll ? outputCollector.getOutput('', OutputType.js) : generated;
@@ skipping 22 matching lines @@
     } else {
       source = {'main.dart': code};
     }
 
     CompilationResult result = await runCompiler(
         memorySourceFiles: source,
         options: options,
         outputProvider: outputCollector);
     Expect.isTrue(result.isSuccess);
     Compiler compiler = result.compiler;
-    LibraryElement mainApp = compiler.mainApp;
+    LibraryElement mainApp =
+        compiler.frontendStrategy.elementEnvironment.mainLibrary;
     Element element = mainApp.find(entry);
     js.JavaScriptBackend backend = compiler.backend;
     String generated = backend.getGeneratedCode(element);
     if (check != null) {
       check(generated);
     }
     return returnAll ? outputCollector.getOutput('', OutputType.js) : generated;
   }
 }
 
@@ skipping 49 matching lines @@
     if (path == 'main.dart') return;
     compiler.registerSource(base.resolve(path), code);
   });
 
   return compiler.run(mainUri).then((_) {
     return check(compiler);
   });
 }
 
 Element findElement(compiler, String name, [Uri library]) {
-  LibraryElement lib = compiler.mainApp;
+  LibraryElement lib = compiler.frontendStrategy.elementEnvironment.mainLibrary;
   if (library != null) {
     lib = compiler.libraryLoader.lookupLibrary(library);
     Expect.isNotNull(lib, 'Could not locate library $library.');
   }
   var element = lib.find(name);
   Expect.isNotNull(element, 'Could not locate $name.');
   return element;
 }
 
 String anyIdentifier = "[a-zA-Z][a-zA-Z0-9]*";
@@ skipping 88 matching lines @@
     }
   }
 
   return checker;
 }
 
 RegExp _directivePattern = new RegExp(
     //      \1                     \2        \3
     r'''// *(present|absent): *(?:"([^"]*)"|'([^'']*)')''',
     multiLine: true);