Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/gtk/browser_window_gtk.cc

Index: chrome/browser/ui/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 93300ac20feb92cbe376dfb7342d3429f98201c8..ba419864b80c316636f3ef3605926d2e33349f73 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -29,6 +29,7 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/extensions/tab_helper.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
@@ -1485,7 +1486,8 @@ GtkWidget* BrowserWindowGtk::titlebar_widget() const {
 }
 
 // static
-void BrowserWindowGtk::RegisterUserPrefs(PrefServiceSyncable* prefs) {
+void BrowserWindowGtk::RegisterUserPrefs(PrefService* prefs,
+                                         PrefRegistrySyncable* registry) {
   bool custom_frame_default = false;
   // Avoid checking the window manager if we're not connected to an X server (as
   // is the case in Valgrind tests).

[Mattias Nissler (ping if slow), 2013/02/06 17:53:33]

TODO remove prefs parameter.

[Jói, 2013/02/07 14:52:32]

Done.

@@ -1493,9 +1495,9 @@ void BrowserWindowGtk::RegisterUserPrefs(PrefServiceSyncable* prefs) {
       !prefs->HasPrefPath(prefs::kUseCustomChromeFrame)) {
     custom_frame_default = GetCustomFramePrefDefault();
   }
-  prefs->RegisterBooleanPref(prefs::kUseCustomChromeFrame,
-                             custom_frame_default,
-                             PrefServiceSyncable::UNSYNCABLE_PREF);
+  registry->RegisterBooleanPref(prefs::kUseCustomChromeFrame,
+                                custom_frame_default,
+                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 WebContents* BrowserWindowGtk::GetDisplayedTab() {