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

sync/syncable/directory.cc

Index: sync/syncable/directory.cc
diff --git a/sync/syncable/directory.cc b/sync/syncable/directory.cc
index b6d314364fd0f3bb11a6e48557dfda6853d8cf7c..ca1efc1c95bda86f708e288e667e15b106d39b25 100644
--- a/sync/syncable/directory.cc
+++ b/sync/syncable/directory.cc
@@ -9,6 +9,7 @@
 
 #include <algorithm>
 #include <iterator>
+#include <utility>
 
 #include "base/base64.h"
 #include "base/guid.h"
@@ -1157,7 +1158,7 @@ std::unique_ptr<base::ListValue> Directory::GetNodeDetailsForType(
       node->SetInteger("positionIndex", GetPositionIndex(trans, kernel));
     }
 
-    nodes->Append(node.release());
+    nodes->Append(std::move(node));
   }
 
   return nodes;