replace deprecated version of SetWithoutPathExpansion

extensions/browser/value_store/value_store_change.cc

 // Copyright 2014 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 "extensions/browser/value_store/value_store_change.h"
 
 #include <utility>
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 
 // static
 std::string ValueStoreChange::ToJson(
     const ValueStoreChangeList& changes) {
   base::DictionaryValue changes_value;
   for (ValueStoreChangeList::const_iterator it = changes.begin();
       it != changes.end(); ++it) {
-    base::DictionaryValue* change_value = new base::DictionaryValue();
+    std::unique_ptr<base::DictionaryValue> change_value =
+        base::MakeUnique<base::DictionaryValue>();
     if (it->old_value()) {
       change_value->Set("oldValue", it->old_value()->DeepCopy());
     }
     if (it->new_value()) {
       change_value->Set("newValue", it->new_value()->DeepCopy());
     }
-    changes_value.SetWithoutPathExpansion(it->key(), change_value);
+    changes_value.SetWithoutPathExpansion(it->key(), std::move(change_value));
   }
   std::string json;
   bool success = base::JSONWriter::Write(changes_value, &json);
   DCHECK(success);
   return json;
 }
 
 ValueStoreChange::ValueStoreChange(const std::string& key,
                                    std::unique_ptr<base::Value> old_value,
                                    std::unique_ptr<base::Value> new_value)
@@ skipping 19 matching lines @@
 }
 
 ValueStoreChange::Inner::Inner(const std::string& key,
                                std::unique_ptr<base::Value> old_value,
                                std::unique_ptr<base::Value> new_value)
     : key_(key),
       old_value_(std::move(old_value)),
       new_value_(std::move(new_value)) {}
 
 ValueStoreChange::Inner::~Inner() {}