components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/startup/autolaunch_prompt.h

Index: chrome/browser/ui/startup/autolaunch_prompt.h
diff --git a/chrome/browser/ui/startup/autolaunch_prompt.h b/chrome/browser/ui/startup/autolaunch_prompt.h
index a4c70e56d1aab5a0e8ffa6911f1813f4d6c51f4a..e56e33045fa19cce212b7a2306a9759df17db29a 100644
--- a/chrome/browser/ui/startup/autolaunch_prompt.h
+++ b/chrome/browser/ui/startup/autolaunch_prompt.h
@@ -5,9 +5,12 @@
 #ifndef CHROME_BROWSER_UI_STARTUP_AUTOLAUNCH_PROMPT_H_
 #define CHROME_BROWSER_UI_STARTUP_AUTOLAUNCH_PROMPT_H_
 
-class PrefRegistrySyncable;
 class Browser;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace chrome {
 
 // Determines whether or not the auto-launch prompt should be shown, and shows
@@ -15,7 +18,7 @@ namespace chrome {
 bool ShowAutolaunchPrompt(Browser* browser);
 
 // Registers auto-launch specific prefs.
-void RegisterAutolaunchUserPrefs(PrefRegistrySyncable* registry);
+void RegisterAutolaunchUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
 }  // namespace chrome