detect preferences errors

chrome/installer/util/google_chrome_distribution.cc

 // Copyright (c) 2009 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.
 //
 // This file defines specific implementation of BrowserDistribution class for
 // Google Chrome.
 
 #include "chrome/installer/util/google_chrome_distribution.h"
 
 #include <windows.h>
@@ skipping 174 matching lines @@
 
   return has_values;
 }
 
 bool GoogleChromeDistribution::ExtractUninstallMetricsFromFile(
     const std::wstring& file_path, std::wstring* uninstall_metrics_string) {
 
   JSONFileValueSerializer json_serializer(FilePath::FromWStringHack(file_path));
 
   std::string json_error_string;
-  scoped_ptr<Value> root(json_serializer.Deserialize(NULL));
+  scoped_ptr<Value> root(json_serializer.Deserialize(NULL, NULL));
   if (!root.get())
     return false;
 
   // Preferences should always have a dictionary root.
   if (!root->IsType(Value::TYPE_DICTIONARY))
     return false;
 
   return ExtractUninstallMetrics(*static_cast<DictionaryValue*>(root.get()),
                                  uninstall_metrics_string);
 }
@@ skipping 376 matching lines @@
   GoogleUpdateSettings::SetClient(GetExperimentGroup(outcome, flavor));
   if (outcome != kToastExpUninstallGroup)
     return;
   // The user wants to uninstall. This is a best effort operation. Note that
   // we waited for chrome to exit so the uninstall would not detect chrome
   // running.
   base::LaunchApp(InstallUtil::GetChromeUninstallCmd(system_install),
                   false, false, NULL);
 }
 #endif