components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/prefs/chrome_pref_service_factory.h

Index: chrome/browser/prefs/chrome_pref_service_factory.h
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.h b/chrome/browser/prefs/chrome_pref_service_factory.h
index 93e02cfe09bf865807840103702cbbc0b490c8bf..7c308ebfa56d2f78ccaacb86805a9fe4fb26411b 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.h
+++ b/chrome/browser/prefs/chrome_pref_service_factory.h
@@ -17,11 +17,14 @@ class PolicyService;
 }
 
 class PrefRegistry;
-class PrefRegistrySyncable;
 class PrefService;
 class PrefServiceSyncable;
 class PrefStore;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace chrome_prefs {
 
 // Factory methods that create and initialize a new instance of a
@@ -52,7 +55,7 @@ PrefServiceSyncable* CreateProfilePrefs(
     base::SequencedTaskRunner* pref_io_task_runner,
     policy::PolicyService* policy_service,
     const scoped_refptr<PrefStore>& extension_prefs,
-    const scoped_refptr<PrefRegistrySyncable>& pref_registry,
+    const scoped_refptr<user_prefs::PrefRegistrySyncable>& pref_registry,
     bool async);
 
 }  // namespace chrome_prefs