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

sdk/lib/_internal/pub_generated/test/transformer/can_log_messages_test.dart

Index: sdk/lib/_internal/pub_generated/test/transformer/can_log_messages_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/can_log_messages_test.dart b/sdk/lib/_internal/pub_generated/test/transformer/can_log_messages_test.dart
similarity index 87%
copy from sdk/lib/_internal/pub/test/transformer/can_log_messages_test.dart
copy to sdk/lib/_internal/pub_generated/test/transformer/can_log_messages_test.dart
index da82d5dd4dcc9ea6cd02c49740a091aacf6d6032..ca37e51e423ddc753b139663bb7fc204bd8af77c 100644
--- a/sdk/lib/_internal/pub/test/transformer/can_log_messages_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/transformer/can_log_messages_test.dart
@@ -74,18 +74,12 @@ main() {
 
 void runTest(String transformerText) {
   integration("can log messages", () {
-    d.dir(appPath, [
-      d.pubspec({
+    d.dir(appPath, [d.pubspec({
         "name": "myapp",
         "transformers": ["myapp/src/transformer"]
       }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", transformerText)
-      ])]),
-      d.dir("web", [
-        d.file("foo.txt", "foo")
-      ])
-    ]).create();
+          d.dir("lib", [d.dir("src", [d.file("transformer.dart", transformerText)])]),
+          d.dir("web", [d.file("foo.txt", "foo")])]).create();
 
     createLockFile('myapp', pkg: ['barback']);
 
@@ -106,11 +100,10 @@ Warning!
     // The details of the analyzer's error message change pretty frequently,
     // so instead of validating the entire line, just look for a couple of
     // salient bits of information.
-    pub.stderr.expect(allOf([
-      contains("2"),                              // The line number.
-      contains("1"),                              // The column number.
-      contains("http://fake.com/not_real.dart"),  // The library.
-      contains("ERROR"),                          // That it's an error.
+    pub.stderr.expect(allOf([contains("2"), // The line number.
+      contains("1"), // The column number.
+      contains("http://fake.com/not_real.dart"), // The library.
+      contains("ERROR"), // That it's an error.
     ]));
 
     // In barback >=0.15.0, the span will point to the location where the error