startup: Put it in chrome namespace.

chrome/browser/ui/startup/autolaunch_prompt.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.
 
 #ifndef CHROME_BROWSER_UI_STARTUP_AUTOLAUNCH_PROMPT_H_
 #define CHROME_BROWSER_UI_STARTUP_AUTOLAUNCH_PROMPT_H_
 #pragma once
 
 class PrefService;
 class Profile;
 
-namespace browser {
+namespace chrome {
 
 // Determines whether or not the auto-launch prompt should be shown, and shows
 // it as needed. Returns true if it was shown, false otherwise.
 bool ShowAutolaunchPrompt(Profile* profile);
 
 // Registers auto-launch specific prefs.
 void RegisterAutolaunchPrefs(PrefService* prefs);
 
-}  // namespace browser
-
+}  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_STARTUP_AUTOLAUNCH_PROMPT_H_