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

sdk/lib/_internal/pub_generated/test/hosted/offline_test.dart

Index: sdk/lib/_internal/pub_generated/test/hosted/offline_test.dart
diff --git a/sdk/lib/_internal/pub/test/hosted/offline_test.dart b/sdk/lib/_internal/pub_generated/test/hosted/offline_test.dart
similarity index 73%
copy from sdk/lib/_internal/pub/test/hosted/offline_test.dart
copy to sdk/lib/_internal/pub_generated/test/hosted/offline_test.dart
index 0d7b2d80d07623364c477e7e7de59f79c0cc0b12..8a3bae5430a54503087065f5004f42125a40356d 100644
--- a/sdk/lib/_internal/pub/test/hosted/offline_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/hosted/offline_test.dart
@@ -27,8 +27,9 @@ main() {
 
       var warning = null;
       if (command == RunCommand.upgrade) {
-        warning = "Warning: Upgrading when offline may not update you "
-                  "to the latest versions of your dependencies.";
+        warning =
+            "Warning: Upgrading when offline may not update you "
+                "to the latest versions of your dependencies.";
       }
 
       pubCommand(command, args: ['--offline'], warning: warning);
@@ -43,9 +44,13 @@ main() {
       // Run the server so that we know what URL to use in the system cache.
       serveNoPackages();
 
-      d.appDir({"foo": "any"}).create();
+      d.appDir({
+        "foo": "any"
+      }).create();
 
-      pubCommand(command, args: ['--offline'],
+      pubCommand(
+          command,
+          args: ['--offline'],
           error: "Could not find package foo in cache.");
     });
 
@@ -57,11 +62,15 @@ main() {
         "foo": ["1.2.2", "1.2.3"]
       }, includePubspecs: true).create();
 
-      d.appDir({"foo": ">2.0.0"}).create();
+      d.appDir({
+        "foo": ">2.0.0"
+      }).create();
 
-      pubCommand(command, args: ['--offline'], error:
-          "Package foo has no versions that match >2.0.0 derived from:\n"
-          "- myapp 0.0.0 depends on version >2.0.0");
+      pubCommand(
+          command,
+          args: ['--offline'],
+          error: "Package foo has no versions that match >2.0.0 derived from:\n"
+              "- myapp 0.0.0 depends on version >2.0.0");
     });
   });
 }