Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/bookmarks/bookmark_utils.cc

Index: chrome/browser/bookmarks/bookmark_utils.cc
diff --git a/chrome/browser/bookmarks/bookmark_utils.cc b/chrome/browser/bookmarks/bookmark_utils.cc
index 329654e340d25d36c5b2006b4d64b2295b52e5e9..6d63505d99e4928b9c58f864690164b0a2942c02 100644
--- a/chrome/browser/bookmarks/bookmark_utils.cc
+++ b/chrome/browser/bookmarks/bookmark_utils.cc
@@ -18,7 +18,8 @@
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/bookmarks/bookmark_node_data.h"
 #include "chrome/browser/history/query_parser.h"
-#include "chrome/browser/prefs/pref_service_syncable.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"
 #include "content/public/browser/user_metrics.h"
@@ -431,13 +432,13 @@ const BookmarkNode* ApplyEditsWithPossibleFolderChange(
   return node;
 }
 
-void RegisterUserPrefs(PrefServiceSyncable* prefs) {
-  prefs->RegisterBooleanPref(prefs::kShowBookmarkBar,
-                             false,
-                             PrefServiceSyncable::SYNCABLE_PREF);
-  prefs->RegisterBooleanPref(prefs::kEditBookmarksEnabled,
-                             true,
-                             PrefServiceSyncable::UNSYNCABLE_PREF);
+void RegisterUserPrefs(PrefRegistrySyncable* registry) {
+  registry->RegisterBooleanPref(prefs::kShowBookmarkBar,
+                                false,
+                                PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterBooleanPref(prefs::kEditBookmarksEnabled,
+                                true,
+                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 const BookmarkNode* GetParentForNewNodes(