Change more base::ListValue methods to use std::unique_ptr.

rlz/chromeos/lib/rlz_value_store_chromeos.h

Index: rlz/chromeos/lib/rlz_value_store_chromeos.h
diff --git a/rlz/chromeos/lib/rlz_value_store_chromeos.h b/rlz/chromeos/lib/rlz_value_store_chromeos.h
index 182ba0eb2ac705aec5081c988a62053abe7cc2e2..418b83e13dda682f0c8f6450371b28ce4b52766a 100644
--- a/rlz/chromeos/lib/rlz_value_store_chromeos.h
+++ b/rlz/chromeos/lib/rlz_value_store_chromeos.h
@@ -70,7 +70,8 @@ class RlzValueStoreChromeOS : public RlzValueStore,
   void WriteStore();
 
   // Adds |value| to list at |list_name| path in JSON store.
-  bool AddValueToList(const std::string& list_name, base::Value* value);
+  bool AddValueToList(const std::string& list_name,
+                      std::unique_ptr<base::Value> value);
   // Removes |value| from list at |list_name| path in JSON store.
   bool RemoveValueFromList(const std::string& list_name,
                            const base::Value& value);