components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/policy/url_blacklist_manager.h

Index: chrome/browser/policy/url_blacklist_manager.h
diff --git a/chrome/browser/policy/url_blacklist_manager.h b/chrome/browser/policy/url_blacklist_manager.h
index d722e45507356029077bf86fa6fd72b6a4feffe4..f0e0b0ff9fbaedea385b675df71f5b7be298d9f4 100644
--- a/chrome/browser/policy/url_blacklist_manager.h
+++ b/chrome/browser/policy/url_blacklist_manager.h
@@ -19,7 +19,6 @@
 
 class GURL;
 class PrefService;
-class PrefRegistrySyncable;
 
 namespace base {
 class ListValue;
@@ -29,6 +28,10 @@ namespace net {
 class URLRequest;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace policy {
 
 // Contains a set of filters to block and allow certain URLs, and matches GURLs
@@ -145,7 +148,7 @@ class URLBlacklistManager {
   virtual void SetBlacklist(scoped_ptr<URLBlacklist> blacklist);
 
   // Registers the preferences related to blacklisting in the given PrefService.
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
  protected:
   // Used to delay updating the blacklist while the preferences are