Remove more usage of the base::ListValue::Append(Value*) overload.

chrome/test/chromedriver/element_util.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_TEST_CHROMEDRIVER_ELEMENT_UTIL_H_
 #define CHROME_TEST_CHROMEDRIVER_ELEMENT_UTIL_H_
 
 #include <memory>
 #include <string>
 
 #include "chrome/test/chromedriver/basic_types.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 class Value;
 }
 
 struct Session;
 class Status;
 class WebView;
 
-base::DictionaryValue* CreateElement(const std::string& element_id);
+std::unique_ptr<base::DictionaryValue> CreateElement(
+    const std::string& element_id);
 
-base::Value* CreateValueFrom(const WebPoint& point);
+std::unique_ptr<base::DictionaryValue> CreateValueFrom(const WebPoint& point);
 
 // |root_element_id| could be null when no root element is given.
 Status FindElement(int interval_ms,
                    bool only_one,
                    const std::string* root_element_id,
                    Session* session,
                    WebView* web_view,
                    const base::DictionaryValue& params,
                    std::unique_ptr<base::Value>* value);
 
@@ skipping 108 matching lines @@
 Status ScrollElementRegionIntoView(
     Session* session,
     WebView* web_view,
     const std::string& element_id,
     const WebRect& region,
     bool center,
     const std::string& clickable_element_id,
     WebPoint* location);
 
 #endif  // CHROME_TEST_CHROMEDRIVER_ELEMENT_UTIL_H_