Revert of Add PrefStore::GetValues

components/prefs/pref_value_map.cc

Index: components/prefs/pref_value_map.cc
diff --git a/components/prefs/pref_value_map.cc b/components/prefs/pref_value_map.cc
index ecacf4c73d4b550f61c292d2047646b6776b0493..f0392d25284319b4a7b62340065d14c4d483f56d 100644
--- a/components/prefs/pref_value_map.cc
+++ b/components/prefs/pref_value_map.cc
@@ -157,11 +157,3 @@
   for ( ; other_pref != other_prefs.end(); ++other_pref)
       differing_keys->push_back(other_pref->first);
 }
-
-std::unique_ptr<base::DictionaryValue> PrefValueMap::AsDictionaryValue() const {
-  auto dictionary = base::MakeUnique<base::DictionaryValue>();
-  for (const auto& value : prefs_) {
-    dictionary->Set(value.first, value.second->CreateDeepCopy());
-  }
-  return dictionary;
-}