Delete dart2js_resolver and fix some typos in README

pkg/compiler/lib/src/dart2js_resolver.dart

-// Copyright (c) 2016, 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:io';
-import 'dart:async';
-
-import 'package:compiler/src/apiimpl.dart';
-import 'package:compiler/src/filenames.dart';
-import 'package:compiler/src/null_compiler_output.dart';
-import 'package:compiler/src/options.dart';
-import 'package:compiler/src/serialization/json_serializer.dart';
-import 'package:compiler/src/source_file_provider.dart';
-import 'package:package_config/discovery.dart';
-import 'package:compiler/src/elements/elements.dart';
-
-Future<String> resolve(List<Uri> inputs,
-    {List<String> deps: const <String>[],
-    List<String> bazelSearchPaths,
-    String root,
-    String packages,
-    Uri packageRoot,
-    String platformConfig}) async {
-  var resolutionInputs = deps
-      .map((uri) => currentDirectory.resolve(nativeToUriPath(uri)))
-      .toList();
-  var libraryRoot = root == null
-      ? Platform.script.resolve('../../../sdk/')
-      : currentDirectory.resolve(nativeToUriPath(root));
-
-  var options = new CompilerOptions(
-      libraryRoot: libraryRoot,
-      resolveOnly: true,
-      analyzeMain: true,
-      resolutionInputs: resolutionInputs,
-      packageRoot: packageRoot,
-      packageConfig:
-          packages != null ? currentDirectory.resolve(packages) : null,
-      packagesDiscoveryProvider: findPackages,
-      platformConfigUri:
-          platformConfig != null ? libraryRoot.resolve(platformConfig) : null);
-
-  var inputProvider = bazelSearchPaths != null
-      ? new BazelInputProvider(bazelSearchPaths)
-      : new CompilerSourceFileProvider();
-
-  var outputProvider = const NullCompilerOutput();
-  var diagnostics = new FormattingDiagnosticHandler(inputProvider)
-    ..enableColors = !Platform.isWindows;
-  var compiler =
-      new CompilerImpl(inputProvider, outputProvider, diagnostics, options);
-
-  await compiler.setupSdk();
-  await compiler.setupPackages(inputs.first);
-
-  var librariesToSerialize = <LibraryElement>[];
-  for (var uri in inputs) {
-    var library = await compiler.analyzeUri(uri);
-    if (library != null) {
-      // [library] is `null` if [uri] is a part file.
-      librariesToSerialize.add(library);
-    }
-  }
-
-  if (librariesToSerialize.isEmpty) {
-    print('no library input files');
-    exit(1);
-  }
-
-  var serializer =
-      compiler.serialization.createSerializer(librariesToSerialize);
-  return serializer.toText(const JsonSerializationEncoder());
-}