Implement a poor man's PostAfterStartupTask() function.

content/browser/appcache/appcache_update_job.h

Index: content/browser/appcache/appcache_update_job.h
diff --git a/content/browser/appcache/appcache_update_job.h b/content/browser/appcache/appcache_update_job.h
index 4d2d896ea74485cbb2757e145de08748a547eca7..8dfd153ac3216ea2cd7118677da6c52f1f9be21c 100644
--- a/content/browser/appcache/appcache_update_job.h
+++ b/content/browser/appcache/appcache_update_job.h
@@ -13,6 +13,7 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "content/browser/appcache/appcache.h"
 #include "content/browser/appcache/appcache_host.h"
@@ -335,6 +336,7 @@ class CONTENT_EXPORT AppCacheUpdateJob
   StoredState stored_state_;
 
   AppCacheStorage* storage_;
+  base::WeakPtrFactory<AppCacheUpdateJob> weak_factory_;
 
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheGroupTest, QueueUpdate);