Add RetainedRef uses where needed.

chrome/browser/sync_file_system/local/root_delete_helper.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync_file_system/local/root_delete_helper.h"
 
 #include "base/sequenced_task_runner.h"
 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_status.h"
 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
@@ skipping 58 matching lines @@
   // Ignore errors, no idea how to deal with it.
 
   DCHECK(!sync_status_->IsWritable(url_));
   DCHECK(!sync_status_->IsWriting(url_));
 
   // All writes to the entire file system must be now blocked, so we have
   // to be able to safely reset the local changes and sync statuses for it.
   // TODO(kinuko): This should be probably automatically handled in
   // DeleteFileSystem via QuotaUtil::DeleteOriginDataOnFileThread.
   file_system_context_->default_file_task_runner()->PostTaskAndReply(
-      FROM_HERE,
-      base::Bind(&ResetFileChangeTracker, file_system_context_, url_),
+      FROM_HERE, base::Bind(&ResetFileChangeTracker,
+                            base::RetainedRef(file_system_context_), url_),
       base::Bind(&RootDeleteHelper::DidResetFileChangeTracker,
                  weak_factory_.GetWeakPtr()));
 }
 
 void RootDeleteHelper::DidResetFileChangeTracker() {
   DCHECK(!sync_status_->IsWritable(url_));
   DCHECK(!sync_status_->IsWriting(url_));
 
   // Reopening the filesystem.
   file_system_context_->sandbox_delegate()->OpenFileSystem(
       url_.origin(),
       url_.type(),
       storage::OPEN_FILE_SYSTEM_CREATE_IF_NONEXISTENT,
       base::Bind(&RootDeleteHelper::DidOpenFileSystem,
                  weak_factory_.GetWeakPtr()),
       GURL());
 }
 
 void RootDeleteHelper::DidOpenFileSystem(const GURL& /* root */,
                                          const std::string& /* name */,
                                          base::File::Error error) {
   FileStatusCallback callback = callback_;
   callback.Run(error);
 }
 
 }  // namespace sync_file_system