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

sdk/lib/_internal/pub_generated/lib/src/command/cache_list.dart

Index: sdk/lib/_internal/pub_generated/lib/src/command/cache_list.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/cache_list.dart b/sdk/lib/_internal/pub_generated/lib/src/command/cache_list.dart
similarity index 87%
copy from sdk/lib/_internal/pub/lib/src/command/cache_list.dart
copy to sdk/lib/_internal/pub_generated/lib/src/command/cache_list.dart
index a9fa4705fa0a7040241368aabae03519e446cf97..78f7e8a0cacfd58daa5c13e5f2c5293ae382542f 100644
--- a/sdk/lib/_internal/pub/lib/src/command/cache_list.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/command/cache_list.dart
@@ -25,11 +25,15 @@ class CacheListCommand extends PubCommand {
     var source = cache.sources.defaultSource as CachedSource;
     for (var package in source.getCachedPackages()) {
       var packageInfo = packagesObj.putIfAbsent(package.name, () => {});
-      packageInfo[package.version.toString()] = {'location': package.dir};
+      packageInfo[package.version.toString()] = {
+        'location': package.dir
+      };
     }
 
     // TODO(keertip): Add support for non-JSON format and check for --format
     // flag.
-    log.message(JSON.encode({'packages': packagesObj}));
+    log.message(JSON.encode({
+      'packages': packagesObj
+    }));
   }
 }