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

sdk/lib/_internal/pub_generated/lib/src/error_group.dart

Index: sdk/lib/_internal/pub_generated/lib/src/error_group.dart
diff --git a/sdk/lib/_internal/pub/lib/src/error_group.dart b/sdk/lib/_internal/pub_generated/lib/src/error_group.dart
similarity index 93%
copy from sdk/lib/_internal/pub/lib/src/error_group.dart
copy to sdk/lib/_internal/pub_generated/lib/src/error_group.dart
index c479a24e9969eefe12e8d788c4520d482bcb6b6a..7efebf3cd6bb18dd3ae95f0403d3f73becb21264 100644
--- a/sdk/lib/_internal/pub/lib/src/error_group.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/error_group.dart
@@ -69,8 +69,8 @@ class ErrorGroup {
   /// error, it's a [StateError] to try to register a new [Future].
   Future registerFuture(Future future) {
     if (_isDone) {
-      throw new StateError("Can't register new members on a complete "
-          "ErrorGroup.");
+      throw new StateError(
+          "Can't register new members on a complete " "ErrorGroup.");
     }
 
     var wrapped = new _ErrorGroupFuture(this, future);
@@ -92,8 +92,8 @@ class ErrorGroup {
   /// error, it's a [StateError] to try to register a new [Stream].
   Stream registerStream(Stream stream) {
     if (_isDone) {
-      throw new StateError("Can't register new members on a complete "
-          "ErrorGroup.");
+      throw new StateError(
+          "Can't register new members on a complete " "ErrorGroup.");
     }
 
     var wrapped = new _ErrorGroupStream(this, stream);
@@ -136,7 +136,9 @@ class ErrorGroup {
 
     _isDone = true;
     _done._signalError(error, stackTrace);
-    if (!caught && !_done._hasListeners) scheduleMicrotask((){ throw error; });
+    if (!caught && !_done._hasListeners) scheduleMicrotask(() {
+      throw error;
+    });
   }
 
   /// Notifies [this] that one of its member [Future]s is complete.
@@ -257,12 +259,12 @@ class _ErrorGroupStream extends Stream {
   /// Creates a new [_ErrorGroupFuture] that's a child of [_group] and wraps
   /// [inner].
   _ErrorGroupStream(this._group, Stream inner)
-    : _controller = new StreamController(sync: true) {
+      : _controller = new StreamController(sync: true) {
     // Use old-style asBroadcastStream behavior - cancel source _subscription
     // the first time the stream has no listeners.
-    _stream = inner.isBroadcast
-        ? _controller.stream.asBroadcastStream(onCancel: (sub) => sub.cancel())
-        : _controller.stream;
+    _stream = inner.isBroadcast ?
+        _controller.stream.asBroadcastStream(onCancel: (sub) => sub.cancel()) :
+        _controller.stream;
     _subscription = inner.listen((v) {
       _controller.add(v);
     }, onError: (e, [stackTrace]) {
@@ -274,10 +276,10 @@ class _ErrorGroupStream extends Stream {
     });
   }
 
-  StreamSubscription listen(void onData(value),
-      {Function onError, void onDone(),
-       bool cancelOnError}) {
-    return _stream.listen(onData,
+  StreamSubscription listen(void onData(value), {Function onError, void
+      onDone(), bool cancelOnError}) {
+    return _stream.listen(
+        onData,
         onError: onError,
         onDone: onDone,
         cancelOnError: true);