Revert of Add PrefStore::GetValues

components/prefs/pref_value_map.h

Index: components/prefs/pref_value_map.h
diff --git a/components/prefs/pref_value_map.h b/components/prefs/pref_value_map.h
index bad10cf978487bcab777ec445066d9ad20049052..b0ffbd15fdda3ef1900cf507aec5bd4768d10a24 100644
--- a/components/prefs/pref_value_map.h
+++ b/components/prefs/pref_value_map.h
@@ -14,7 +14,6 @@
 #include "components/prefs/base_prefs_export.h"
 
 namespace base {
-class DictionaryValue;
 class Value;
 }
 
@@ -84,9 +83,6 @@
   void GetDifferingKeys(const PrefValueMap* other,
                         std::vector<std::string>* differing_keys) const;
 
-  // Copies the map into a dictionary value.
-  std::unique_ptr<base::DictionaryValue> AsDictionaryValue() const;
-
  private:
   Map prefs_;