base::ListValue::Append cleanup: pass unique_ptr instead of the released pointer.

chrome/browser/sync_file_system/drive_backend/metadata_database.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/drive_backend/metadata_database.h"
 
 #include <algorithm>
 #include <stack>
 #include <utility>
 
@@ skipping 1611 matching lines @@
     file->Set("details", details);
 
     files->Append(file);
   }
 
   return files;
 }
 
 std::unique_ptr<base::ListValue> MetadataDatabase::DumpDatabase() {
   std::unique_ptr<base::ListValue> list(new base::ListValue);
-  list->Append(DumpTrackers().release());
-  list->Append(DumpMetadata().release());
+  list->Append(DumpTrackers());
+  list->Append(DumpMetadata());
   return list;
 }
 
 bool MetadataDatabase::HasNewerFileMetadata(const std::string& file_id,
                                             int64_t change_id) {
   FileMetadata metadata;
   if (!index_->GetFileMetadata(file_id, &metadata))
     return false;
   DCHECK(metadata.has_details());
   return metadata.details().change_id() >= change_id;
@@ skipping 160 matching lines @@
       return false;
 
   if (!parents.empty())
     return false;
 
   return true;
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system