Avoid status strings on successful ValueStore status.

extensions/browser/value_store/lazy_leveldb.cc

Index: extensions/browser/value_store/lazy_leveldb.cc
diff --git a/extensions/browser/value_store/lazy_leveldb.cc b/extensions/browser/value_store/lazy_leveldb.cc
index 8176b8395f2a6e983c752d2ed33d6315fe6edc61..ca5501d075f90b056b7d8a160d15dbf76e26d90e 100644
--- a/extensions/browser/value_store/lazy_leveldb.cc
+++ b/extensions/browser/value_store/lazy_leveldb.cc
@@ -253,6 +253,9 @@ ValueStore::Status LazyLevelDb::EnsureDbIsOpen() {
 
 ValueStore::Status LazyLevelDb::ToValueStoreError(
     const leveldb::Status& status) {
+  if (status.ok())
+    return ValueStore::Status();
+
   CHECK(!status.IsNotFound());  // not an error
 
   std::string message = status.ToString();