Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

chrome/browser/extensions/api/identity/identity_apitest.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 <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 472 matching lines @@
     testing::Message msg("Expected: ");
     for (std::vector<std::string>::const_iterator it = accounts.begin();
          it != accounts.end();
          ++it) {
       msg << *it << " ";
     }
     msg << "Actual: ";
     if (!results) {
       msg << "NULL";
     } else {
-      for (base::ListValue::const_iterator it = results->begin();
-           it != results->end();
-           ++it) {
+      for (const auto& result : *results) {
         std::unique_ptr<api::identity::AccountInfo> info =
-            api::identity::AccountInfo::FromValue(**it);
+            api::identity::AccountInfo::FromValue(*result);
         if (info.get())
           msg << info->id << " ";
         else
-          msg << *it << "<-" << (*it)->GetType() << " ";
+          msg << *result << "<-" << result->GetType() << " ";
       }
     }
 
     return testing::AssertionFailure(msg);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(IdentityGetAccountsFunctionTest, MultiAccountOn) {
   EXPECT_TRUE(switches::IsExtensionsMultiAccount());
 }
@@ skipping 1386 matching lines @@
   EXPECT_EQ(std::string("https://abcdefghij.chromiumapp.org/callback#test"),
             url);
 }
 
 }  // namespace extensions
 
 // Tests the chrome.identity API implemented by custom JS bindings .
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ChromeIdentityJsBindings) {
   ASSERT_TRUE(RunExtensionTest("identity/js_bindings")) << message_;
 }