Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/lib/src/barback/dart2js_transformer.dart

Index: sdk/lib/_internal/pub_generated/lib/src/barback/dart2js_transformer.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/dart2js_transformer.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/dart2js_transformer.dart
similarity index 87%
copy from sdk/lib/_internal/pub/lib/src/barback/dart2js_transformer.dart
copy to sdk/lib/_internal/pub_generated/lib/src/barback/dart2js_transformer.dart
index 35740f0e5d25275532effb224178d2a9d78abab5..3910ef8be56924bf5cc542e758c0fb7094c1a166 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/dart2js_transformer.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/dart2js_transformer.dart
@@ -13,8 +13,7 @@ import 'package:path/path.dart' as path;
 import 'package:pool/pool.dart';
 
 import '../../../../../../../pkg/compiler/lib/compiler.dart' as compiler;
-import '../../../../../../../pkg/compiler/lib/src/dart2js.dart'
-    show AbortLeg;
+import '../../../../../../../pkg/compiler/lib/src/dart2js.dart' show AbortLeg;
 import '../../../../../../../pkg/compiler/lib/src/io/source_file.dart';
 import '../barback.dart';
 import '../dart.dart' as dart;
@@ -22,11 +21,19 @@ import '../utils.dart';
 import 'asset_environment.dart';
 
 /// The set of all valid configuration options for this transformer.
-final _validOptions = new Set<String>.from([
-  'commandLineOptions', 'checked', 'csp', 'minify', 'verbose', 'environment',
-  'preserveUris', 'suppressWarnings', 'suppressHints',
-  'suppressPackageWarnings', 'terse'
-]);
+final _validOptions = new Set<String>.from(
+    [
+        'commandLineOptions',
+        'checked',
+        'csp',
+        'minify',
+        'verbose',
+        'environment',
+        'preserveUris',
+        'suppressWarnings',
+        'suppressHints',
+        'suppressPackageWarnings',
+        'terse']);
 
 /// A [Transformer] that uses dart2js's library API to transform Dart
 /// entrypoints in "web" to JavaScript.
@@ -45,13 +52,13 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
   bool get _generateSourceMaps => _settings.mode != BarbackMode.RELEASE;
 
   Dart2JSTransformer.withSettings(this._environment, this._settings) {
-    var invalidOptions = _settings.configuration.keys.toSet()
-        .difference(_validOptions);
+    var invalidOptions =
+        _settings.configuration.keys.toSet().difference(_validOptions);
     if (invalidOptions.isEmpty) return;
 
-    throw new FormatException("Unrecognized dart2js "
-        "${pluralize('option', invalidOptions.length)} "
-        "${toSentence(invalidOptions.map((option) => '"$option"'))}.");
+    throw new FormatException(
+        "Unrecognized dart2js " "${pluralize('option', invalidOptions.length)} "
+            "${toSentence(invalidOptions.map((option) => '"$option"'))}.");
   }
 
   Dart2JSTransformer(AssetEnvironment environment, BarbackMode mode)
@@ -79,8 +86,8 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
         var stopwatch = new Stopwatch()..start();
         return _doCompilation(transform).then((_) {
           stopwatch.stop();
-          transform.logger.info("Took ${stopwatch.elapsed} to compile "
-              "${transform.primaryInput.id}.");
+          transform.logger.info(
+              "Took ${stopwatch.elapsed} to compile " "${transform.primaryInput.id}.");
         });
       });
     });
@@ -115,7 +122,9 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
 
   /// Run the dart2js compiler.
   Future _doCompilation(Transform transform) {
-    var provider = new _BarbackCompilerProvider(_environment, transform,
+    var provider = new _BarbackCompilerProvider(
+        _environment,
+        transform,
         generateSourceMaps: _generateSourceMaps);
 
     // Create a "path" to the entrypoint script. The entrypoint may not actually
@@ -130,12 +139,14 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
     // make sure paths in errors are mapped to the original source path so they
     // can understand them.
     return dart.compile(
-        entrypoint, provider,
+        entrypoint,
+        provider,
         commandLineOptions: _configCommandLineOptions,
         csp: _configBool('csp'),
         checked: _configBool('checked'),
         minify: _configBool(
-            'minify', defaultsTo: _settings.mode == BarbackMode.RELEASE),
+            'minify',
+            defaultsTo: _settings.mode == BarbackMode.RELEASE),
         verbose: _configBool('verbose'),
         environment: _configEnvironment,
         packageRoot: _environment.rootPackage.path("packages"),
@@ -144,7 +155,8 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
         suppressWarnings: _configBool('suppressWarnings'),
         suppressHints: _configBool('suppressHints'),
         suppressPackageWarnings: _configBool(
-            'suppressPackageWarnings', defaultsTo: true),
+            'suppressPackageWarnings',
+            defaultsTo: true),
         terse: _configBool('terse'),
         includeSourceMapUrls: _settings.mode != BarbackMode.RELEASE);
   }
@@ -158,9 +170,10 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
       return options;
     }
 
-    throw new FormatException('Invalid value for '
-        '\$dart2js.commandLineOptions: ${JSON.encode(options)} (expected list '
-        'of strings).');
+    throw new FormatException(
+        'Invalid value for '
+            '\$dart2js.commandLineOptions: ${JSON.encode(options)} (expected list '
+            'of strings).');
   }
 
   /// Parses and returns the "environment" configuration option.
@@ -174,8 +187,9 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
       return environment;
     }
 
-    throw new FormatException('Invalid value for \$dart2js.environment: '
-        '${JSON.encode(environment)} (expected map from strings to strings).');
+    throw new FormatException(
+        'Invalid value for \$dart2js.environment: '
+            '${JSON.encode(environment)} (expected map from strings to strings).');
   }
 
   /// Parses and returns a boolean configuration option.
@@ -185,8 +199,9 @@ class Dart2JSTransformer extends Transformer implements LazyTransformer {
     if (!_settings.configuration.containsKey(name)) return defaultsTo;
     var value = _settings.configuration[name];
     if (value is bool) return value;
-    throw new FormatException('Invalid value for \$dart2js.$name: '
-        '${JSON.encode(value)} (expected true or false).');
+    throw new FormatException(
+        'Invalid value for \$dart2js.$name: '
+            '${JSON.encode(value)} (expected true or false).');
   }
 }
 
@@ -256,10 +271,10 @@ class _BarbackCompilerProvider implements dart.CompilerProvider {
     //     $sdk|lib/lib/...
     //
     // TODO(rnystrom): Fix this if #17751 is fixed.
-    var buildDir = _environment.getSourceDirectoryContaining(
-        _transform.primaryInput.id.path);
-    _libraryRootPath = _environment.rootPackage.path(
-        buildDir, "packages", r"$sdk");
+    var buildDir =
+        _environment.getSourceDirectoryContaining(_transform.primaryInput.id.path);
+    _libraryRootPath =
+        _environment.rootPackage.path(buildDir, "packages", r"$sdk");
   }
 
   /// A [CompilerInputProvider] for dart2js.
@@ -315,8 +330,8 @@ class _BarbackCompilerProvider implements dart.CompilerProvider {
 
   /// A [DiagnosticHandler] for dart2js, loosely based on
   /// [FormattingDiagnosticHandler].
-  void handleDiagnostic(Uri uri, int begin, int end,
-                        String message, compiler.Diagnostic kind) {
+  void handleDiagnostic(Uri uri, int begin, int end, String message,
+      compiler.Diagnostic kind) {
     // TODO(ahe): Remove this when source map is handled differently.
     if (kind.name == "source map") return;
 
@@ -397,8 +412,8 @@ class _BarbackCompilerProvider implements dart.CompilerProvider {
     // should be loaded directly from disk.
     var sourcePath = path.fromUri(url);
     if (_environment.containsPath(sourcePath)) {
-      var relative = path.toUri(_environment.rootPackage.relative(sourcePath))
-          .toString();
+      var relative =
+          path.toUri(_environment.rootPackage.relative(sourcePath)).toString();
 
       return new AssetId(_environment.rootPackage.name, relative);
     }