Disk Cache: Replace the backend pointer of the ChildrenDeleter...

net/disk_cache/backend_impl.cc

Index: net/disk_cache/backend_impl.cc
===================================================================
--- net/disk_cache/backend_impl.cc	(revision 53428)
+++ net/disk_cache/backend_impl.cc	(working copy)
@@ -328,6 +328,7 @@
                                uint32 flags, base::MessageLoopProxy* thread,
                                Backend** backend,
                                CompletionCallback* callback) {
+  DCHECK(callback);
   CacheCreator* creator = new CacheCreator(full_path, force, max_bytes, type,
                                            flags, thread, backend, callback);
   // This object will self-destroy when finished.
@@ -538,6 +539,7 @@
     DCHECK(!num_refs_);
   }
   factory_.RevokeAll();
+  ptr_factory_.InvalidateWeakPtrs();
   done_.Signal();
 }