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

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

Index: sdk/lib/_internal/pub_generated/lib/src/barback/transformer_config.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/transformer_config.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/transformer_config.dart
similarity index 90%
copy from sdk/lib/_internal/pub/lib/src/barback/transformer_config.dart
copy to sdk/lib/_internal/pub_generated/lib/src/barback/transformer_config.dart
index c6906dd3f3e4c25724845bf56cded7d0e93094c3..11d959457fdb38b4cc23a0a6f907894ce17883b1 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/transformer_config.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/transformer_config.dart
@@ -63,7 +63,9 @@ class TransformerConfig {
       // Check whether the first path component of the glob is "lib", "bin", or
       // contains wildcards that may cause it to match "lib" or "bin".
       var first = p.posix.split(glob.toString()).first;
-      if (first.contains('{') || first.contains('*') || first.contains('[') ||
+      if (first.contains('{') ||
+          first.contains('*') ||
+          first.contains('[') ||
           first.contains('?')) {
         return true;
       }
@@ -76,8 +78,9 @@ class TransformerConfig {
   ///
   /// [identifierSpan] is the source span for [identifier].
   factory TransformerConfig.parse(String identifier, SourceSpan identifierSpan,
-        YamlMap configuration) =>
-      new TransformerConfig(new TransformerId.parse(identifier, identifierSpan),
+      YamlMap configuration) =>
+      new TransformerConfig(
+          new TransformerId.parse(identifier, identifierSpan),
           configuration);
 
   factory TransformerConfig(TransformerId id, YamlMap configurationNode) {
@@ -92,7 +95,8 @@ class TransformerConfig {
 
       if (field is! List) {
         throw new SourceSpanFormatException(
-            '"$key" field must be a string or list.', fieldNode.span);
+            '"$key" field must be a string or list.',
+            fieldNode.span);
       }
 
       return new Set.from(field.nodes.map((node) {
@@ -101,7 +105,8 @@ class TransformerConfig {
         }
 
         throw new SourceSpanFormatException(
-            '"$key" field may contain only strings.', node.span);
+            '"$key" field may contain only strings.',
+            node.span);
       }));
     }
 
@@ -128,15 +133,16 @@ class TransformerConfig {
       for (var key in configuration.keys) {
         if (key is! String || !key.startsWith(r'$')) continue;
         throw new SourceSpanFormatException(
-            'Unknown reserved field.', configurationNode.nodes[key].span);
+            'Unknown reserved field.',
+            configurationNode.nodes[key].span);
       }
     }
 
     return new TransformerConfig._(id, configuration, span, includes, excludes);
   }
 
-  TransformerConfig._(
-      this.id, this.configuration, this.span, this.includes, this.excludes);
+  TransformerConfig._(this.id, this.configuration, this.span, this.includes,
+      this.excludes);
 
   String toString() => id.toString();