Revert of Add PrefStore::GetValues

components/prefs/value_map_pref_store.cc

Index: components/prefs/value_map_pref_store.cc
diff --git a/components/prefs/value_map_pref_store.cc b/components/prefs/value_map_pref_store.cc
index c31d7c771cc9358db4879386d37a53427e286363..8b828b10d5c628cdc6b2bb9333269e0746554046 100644
--- a/components/prefs/value_map_pref_store.cc
+++ b/components/prefs/value_map_pref_store.cc
@@ -15,10 +15,6 @@
 bool ValueMapPrefStore::GetValue(const std::string& key,
                                  const base::Value** value) const {
   return prefs_.GetValue(key, value);
-}
-
-std::unique_ptr<base::DictionaryValue> ValueMapPrefStore::GetValues() const {
-  return prefs_.AsDictionaryValue();
 }
 
 void ValueMapPrefStore::AddObserver(PrefStore::Observer* observer) {