Revert of Add PrefStore::GetValues

components/prefs/in_memory_pref_store.cc

Index: components/prefs/in_memory_pref_store.cc
diff --git a/components/prefs/in_memory_pref_store.cc b/components/prefs/in_memory_pref_store.cc
index a0a9c35d47b5ee0e5312aaaee28bf6efa88a9c13..d0d35582523908a612263c1bba93cd29b762c422 100644
--- a/components/prefs/in_memory_pref_store.cc
+++ b/components/prefs/in_memory_pref_store.cc
@@ -16,10 +16,6 @@
 bool InMemoryPrefStore::GetValue(const std::string& key,
                                  const base::Value** value) const {
   return prefs_.GetValue(key, value);
-}
-
-std::unique_ptr<base::DictionaryValue> InMemoryPrefStore::GetValues() const {
-  return prefs_.AsDictionaryValue();
 }
 
 bool InMemoryPrefStore::GetMutableValue(const std::string& key,