Change PrefStore::ReadResult to a boolean.

base/prefs/value_map_pref_store.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/prefs/value_map_pref_store.h"
 
 #include <algorithm>
 
 #include "base/stl_util.h"
 #include "base/values.h"
 
 ValueMapPrefStore::ValueMapPrefStore() {}
 
-PrefStore::ReadResult ValueMapPrefStore::GetValue(const std::string& key,
-                                                  const Value** value) const {
-  return prefs_.GetValue(key, value) ? READ_OK : READ_NO_VALUE;
+bool ValueMapPrefStore::GetValue(const std::string& key,
+                                 const Value** value) const {
+  return prefs_.GetValue(key, value);
 }
 
 void ValueMapPrefStore::AddObserver(PrefStore::Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void ValueMapPrefStore::RemoveObserver(PrefStore::Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
@@ skipping 25 matching lines @@
 }
 
 void ValueMapPrefStore::RemoveValue(const std::string& key) {
   if (prefs_.RemoveValue(key))
     FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
 }
 
 void ValueMapPrefStore::NotifyInitializationCompleted() {
   FOR_EACH_OBSERVER(Observer, observers_, OnInitializationCompleted(true));
 }