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

sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart

Index: sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
diff --git a/sdk/lib/_internal/pub/test/get/git/require_pubspec_test.dart b/sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
similarity index 62%
copy from sdk/lib/_internal/pub/test/get/git/require_pubspec_test.dart
copy to sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
index 82d1c83699e506f03f84fb14aaed87a1727c00f5..a81e3761a8059090e41a6dce81852b3706d93512 100644
--- a/sdk/lib/_internal/pub/test/get/git/require_pubspec_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
@@ -12,13 +12,16 @@ main() {
   integration('requires the dependency to have a pubspec', () {
     ensureGit();
 
-    d.git('foo.git', [
-      d.libDir('foo')
-    ]).create();
+    d.git('foo.git', [d.libDir('foo')]).create();
 
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      }
+    }).create();
 
-    pubGet(error: new RegExp(r'Could not find a file named "pubspec\.yaml" '
-        r'in "[^\n]*"\.'));
+    pubGet(
+        error: new RegExp(
+            r'Could not find a file named "pubspec\.yaml" ' r'in "[^\n]*"\.'));
   });
 }