Update behavior of one-click infobar to remove modal dialog, add "undo".

chrome/common/url_constants.h

 // 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.
 
 // Contains constants for known URLs and portions thereof.
 
 #ifndef CHROME_COMMON_URL_CONSTANTS_H_
 #define CHROME_COMMON_URL_CONSTANTS_H_
 #pragma once
 
@@ skipping 251 matching lines @@
 extern const char kSyncGoogleDashboardURL[];
 
 // "Learn more" URL for the auto password generation.
 extern const char kAutoPasswordGenerationLearnMoreURL[];
 
 extern const char kPasswordManagerLearnMoreURL[];
 
 // General help link for Chrome.
 extern const char kChromeHelpURL[];
 
+// "Learn more" URL for the one click signin infobar.
+extern const char kChromeSyncLearnMoreURL[];
+
 // Help URL for the settings page's search feature.
 extern const char kSettingsSearchHelpURL[];
 
 // "About" URL for the translate bar's options menu.
 extern const char kAboutGoogleTranslateURL[];
 
 // Help URL for the Autofill dialog.
 extern const char kAutofillHelpURL[];
 
 // Help URL for the Omnibox setting.
@@ skipping 82 matching lines @@
 #endif
 
 #if defined(OS_CHROMEOS)
 // "Learn more" URL for the Cloud Print section under Options.
 extern const char kCloudPrintLearnMoreURL[];
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_URL_CONSTANTS_H_