Revert of Add PrefStore::GetValues

components/prefs/testing_pref_store.cc

Index: components/prefs/testing_pref_store.cc
diff --git a/components/prefs/testing_pref_store.cc b/components/prefs/testing_pref_store.cc
index d084c4a23fd4bdecacb66a4dd97775ccee952b0b..1e775824a6a9ba1b7a3e6b7673f4b7ea24a7eaff 100644
--- a/components/prefs/testing_pref_store.cc
+++ b/components/prefs/testing_pref_store.cc
@@ -22,10 +22,6 @@
 bool TestingPrefStore::GetValue(const std::string& key,
                                 const base::Value** value) const {
   return prefs_.GetValue(key, value);
-}
-
-std::unique_ptr<base::DictionaryValue> TestingPrefStore::GetValues() const {
-  return prefs_.AsDictionaryValue();
 }
 
 bool TestingPrefStore::GetMutableValue(const std::string& key,