Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

chrome/browser/ui/webui/app_launcher_login_handler.h

 // Copyright (c) 2011 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_BROWSER_UI_WEBUI_APP_LAUNCHER_LOGIN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_APP_LAUNCHER_LOGIN_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 36 matching lines @@
   // Called from JS when the NTP is loaded. |args| is the list of arguments
   // passed from JS and should be an empty list.
   void HandleInitializeSyncLogin(const base::ListValue* args);
 
   // Called from JS when the user clicks the login container. It shows the
   // appropriate UI based on the current sync state. |args| is the list of
   // arguments passed from JS and should be an empty list.
   void HandleShowSyncLoginUI(const base::ListValue* args);
 
   // Records actions in SyncPromo.NTPPromo histogram.
-  void RecordInHistogram(int type);
+  void RecordInHistogram(NTPSignInPromoBuckets type);
 
   // Called from JS when the sync promo NTP bubble has been displayed. |args| is
   // the list of arguments passed from JS and should be an empty list.
   void HandleLoginMessageSeen(const base::ListValue* args);
 
   // Called from JS when the user clicks on the advanced link the sync promo NTP
   // bubble. Use use this to navigate to the sync settings page. |args| is the
   // list of arguments passed from JS and should be an empty list.
   void HandleShowAdvancedLoginUI(const base::ListValue* args);
 
   // Internal helper method
   void UpdateLogin();
 
   // Watches this web UI's profile for info changes (e.g. authenticated username
   // changes).
   std::unique_ptr<ProfileInfoWatcher> profile_info_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLauncherLoginHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_APP_LAUNCHER_LOGIN_HANDLER_H_