components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/content_settings/cookie_settings.cc

Index: chrome/browser/content_settings/cookie_settings.cc
diff --git a/chrome/browser/content_settings/cookie_settings.cc b/chrome/browser/content_settings/cookie_settings.cc
index 38ec99d4876c5776068a155030d22aec9701fe49..a9d3558bc0aa96ec0821a87d0c24f102a9efe340 100644
--- a/chrome/browser/content_settings/cookie_settings.cc
+++ b/chrome/browser/content_settings/cookie_settings.cc
@@ -67,10 +67,11 @@ CookieSettings::Factory::Factory()
 CookieSettings::Factory::~Factory() {}
 
 void CookieSettings::Factory::RegisterUserPrefs(
-    PrefRegistrySyncable* registry) {
-  registry->RegisterBooleanPref(prefs::kBlockThirdPartyCookies,
-                                false,
-                                PrefRegistrySyncable::SYNCABLE_PREF);
+    user_prefs::PrefRegistrySyncable* registry) {
+  registry->RegisterBooleanPref(
+      prefs::kBlockThirdPartyCookies,
+      false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 content::BrowserContext* CookieSettings::Factory::GetBrowserContextToUse(