Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/pepper_flash_settings_manager.cc

Index: chrome/browser/pepper_flash_settings_manager.cc
diff --git a/chrome/browser/pepper_flash_settings_manager.cc b/chrome/browser/pepper_flash_settings_manager.cc
index 3f78afeba927fd0ac610b2e6d1f8cdfab24ded01..b9aaac6ce76065f9a380b7043b1f6bc5b7666932 100644
--- a/chrome/browser/pepper_flash_settings_manager.cc
+++ b/chrome/browser/pepper_flash_settings_manager.cc
@@ -13,6 +13,7 @@
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
@@ -927,14 +928,15 @@ bool PepperFlashSettingsManager::IsPepperFlashInUse(
 }
 
 // static
-void PepperFlashSettingsManager::RegisterUserPrefs(PrefServiceSyncable* prefs) {
-  prefs->RegisterBooleanPref(prefs::kDeauthorizeContentLicenses,
-                             false,
-                             PrefServiceSyncable::UNSYNCABLE_PREF);
-
-  prefs->RegisterBooleanPref(prefs::kPepperFlashSettingsEnabled,
-                             true,
-                             PrefServiceSyncable::UNSYNCABLE_PREF);
+void PepperFlashSettingsManager::RegisterUserPrefs(
+    PrefRegistrySyncable* registry) {
+  registry->RegisterBooleanPref(prefs::kDeauthorizeContentLicenses,
+                                false,
+                                PrefRegistrySyncable::UNSYNCABLE_PREF);
+
+  registry->RegisterBooleanPref(prefs::kPepperFlashSettingsEnabled,
+                                true,
+                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 uint32 PepperFlashSettingsManager::DeauthorizeContentLicenses() {