Remove Compiler.assembledCode.

tests/compiler/dart2js/compiler_alt.dart

-// Copyright (c) 2014, 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.
-
-/// Alternative compile method for dart2js commandline that stores the compiler
-/// for later inspection.
-///
-/// Use this in testing to inspect the compiler after compilation by setting
-/// the `compileFunc` variable in `package:compiler/src/dart2js.dart`
-/// to [compiler] before calling the `internalMain` function.
-
-library dart2js.alt;
-
-import 'dart:async';
-import 'package:compiler/compiler.dart';
-import 'package:compiler/src/apiimpl.dart';
-
-Compiler compiler;
-
-Future<String> compile(Uri script,
-                       Uri libraryRoot,
-                       Uri packageRoot,
-                       CompilerInputProvider inputProvider,
-                       DiagnosticHandler handler,
-                       [List<String> options = const [],
-                        CompilerOutputProvider outputProvider,
-                        Map<String, dynamic> environment = const {}]) {
-  if (!libraryRoot.path.endsWith("/")) {
-    throw new ArgumentError("libraryRoot must end with a /");
-  }
-  if (packageRoot != null && !packageRoot.path.endsWith("/")) {
-    throw new ArgumentError("packageRoot must end with a /");
-  }
-  compiler = new Compiler(inputProvider,
-                          outputProvider,
-                          handler,
-                          libraryRoot,
-                          packageRoot,
-                          options,
-                          environment);
-  return compiler.run(script).then((_) {
-    String code = compiler.assembledCode;
-    if (code != null && outputProvider != null) {
-      code = ''; // Non-null signals success.
-    }
-    return code;
-  });
-}