components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/password_manager/password_manager.h

Index: chrome/browser/password_manager/password_manager.h
diff --git a/chrome/browser/password_manager/password_manager.h b/chrome/browser/password_manager/password_manager.h
index f458ce3b946d4a48c742e3d4a789b743bbcb67b8..0dce8c07295cc96f8c56021ae5277dbdf1d6ad49 100644
--- a/chrome/browser/password_manager/password_manager.h
+++ b/chrome/browser/password_manager/password_manager.h
@@ -21,7 +21,10 @@
 class PasswordManagerDelegate;
 class PasswordManagerTest;
 class PasswordFormManager;
+
+namespace user_prefs {
 class PrefRegistrySyncable;
+}
 
 // Per-tab password manager. Handles creation and management of UI elements,
 // receiving password form data from the renderer and managing the password
@@ -31,7 +34,7 @@ class PasswordManager : public LoginModel,
                         public content::WebContentsObserver,
                         public content::WebContentsUserData<PasswordManager> {
  public:
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   static void CreateForWebContentsAndDelegate(
       content::WebContents* contents,