Provisionally stop working around issues 9252 and 9253.

utils/pub/system_cache.dart

Index: utils/pub/system_cache.dart
diff --git a/utils/pub/system_cache.dart b/utils/pub/system_cache.dart
index e93f8f4f56d07c09971f1ae6d15d976321e02d97..ed5a295103ef3b3b13e6fe4c844ac8ba8a1a3479 100644
--- a/utils/pub/system_cache.dart
+++ b/utils/pub/system_cache.dart
@@ -109,11 +109,9 @@ class SystemCache {
   }
 
   /// Delete's the system cache's internal temp directory.

[Bob Nystrom, 2013/03/20 16:33:42]

"Delete's" -> "Deletes"

[nweiz, 2013/03/20 19:45:46]

*shudder*

-  Future deleteTempDir() {
+  void deleteTempDir() {
     log.fine('Clean up system cache temp directory $tempDir.');
-    return defer(() {
-      if (!dirExists(tempDir)) return;
-      return deleteDir(tempDir);
-    });
+    if (!dirExists(tempDir)) return;
+    deleteDir(tempDir);
   }
 }