components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/webui/plugins_ui.cc

Index: chrome/browser/ui/webui/plugins_ui.cc
diff --git a/chrome/browser/ui/webui/plugins_ui.cc b/chrome/browser/ui/webui/plugins_ui.cc
index 823095a34b715995574480bcb5939b6e8d00ba43..65376c3fdcbd2e2e383514d45032c678e9f66c37 100644
--- a/chrome/browser/ui/webui/plugins_ui.cc
+++ b/chrome/browser/ui/webui/plugins_ui.cc
@@ -491,10 +491,12 @@ base::RefCountedMemory* PluginsUI::GetFaviconResourceBytes(
 }
 
 // static
-void PluginsUI::RegisterUserPrefs(PrefRegistrySyncable* registry) {
-  registry->RegisterBooleanPref(prefs::kPluginsShowDetails,
-                                false,
-                                PrefRegistrySyncable::UNSYNCABLE_PREF);
-  registry->RegisterDictionaryPref(prefs::kContentSettingsPluginWhitelist,
-                                   PrefRegistrySyncable::SYNCABLE_PREF);
+void PluginsUI::RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry) {
+  registry->RegisterBooleanPref(
+      prefs::kPluginsShowDetails,
+      false,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterDictionaryPref(
+      prefs::kContentSettingsPluginWhitelist,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }