Remove raw DictionaryValue::Set in //chrome

chrome/browser/ui/webui/local_state/local_state_ui_unittest.cc

 // Copyright 2016 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 "chrome/browser/ui/webui/local_state/local_state_ui.h"
 
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(LocalStateUiTest, FilterPrefs) {
   std::vector<std::string> prefixes = {"foo", "bar", "baz"};
 
   std::vector<std::string> invalid_pref_keys = {"fo", "ar", "afoo"};
   std::vector<std::string> valid_pref_keys = {"foo", "foom", "bar.stuff"};
 
   std::vector<std::string> all_pref_keys = invalid_pref_keys;
   all_pref_keys.insert(all_pref_keys.end(), valid_pref_keys.begin(),
                        valid_pref_keys.end());
 
   base::DictionaryValue prefs;
   for (const std::string& key : all_pref_keys) {
-    prefs.Set(key, new base::Value(key + "_value"));
+    prefs.SetString(key, key + "_value");
   }
 
   internal::FilterPrefs(prefixes, &prefs);
 
   for (const std::string& invalid_key : invalid_pref_keys) {
     std::string value;
     EXPECT_FALSE(prefs.GetString(invalid_key, &value));
   }
 
   for (const std::string& valid_key : valid_pref_keys) {
     std::string value;
     EXPECT_TRUE(prefs.GetString(valid_key, &value));
     EXPECT_EQ(valid_key + "_value", value);
   }
 }