WIP: Pref service: use the incognito support from Chrome

chrome/browser/prefs/pref_service_syncable_util.h

Index: chrome/browser/prefs/pref_service_syncable_util.h
diff --git a/chrome/browser/prefs/pref_service_syncable_util.h b/chrome/browser/prefs/pref_service_syncable_util.h
index d4149d914d6bd02a0538b404001a686d7beadf1f..14ab5e034228adc96b7d0eaac9f7e327e9f6c3cf 100644
--- a/chrome/browser/prefs/pref_service_syncable_util.h
+++ b/chrome/browser/prefs/pref_service_syncable_util.h
@@ -5,7 +5,6 @@
 #ifndef CHROME_BROWSER_PREFS_PREF_SERVICE_SYNCABLE_UTIL_H_
 #define CHROME_BROWSER_PREFS_PREF_SERVICE_SYNCABLE_UTIL_H_
 
-class PrefStore;
 class Profile;
 
 namespace sync_preferences {
@@ -23,15 +22,5 @@ class PrefServiceSyncable;
 // incognito version) from a Profile.
 sync_preferences::PrefServiceSyncable* PrefServiceSyncableFromProfile(
     Profile* profile);
-sync_preferences::PrefServiceSyncable* PrefServiceSyncableIncognitoFromProfile(
-    Profile* profile);
-
-// Creates an incognito copy of |pref_service| that shares most prefs but uses
-// a fresh non-persistent overlay for the user pref store and an individual
-// extension pref store (to cache the effective extension prefs for incognito
-// windows).
-sync_preferences::PrefServiceSyncable* CreateIncognitoPrefServiceSyncable(
-    sync_preferences::PrefServiceSyncable* pref_service,
-    PrefStore* incognito_extension_pref_store);
 
 #endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_SYNCABLE_UTIL_H_