Remove PrefService::ScheduleSavePersistentPrefs and SavePersistentPrefs.

chrome/browser/prefs/incognito_user_pref_store.cc

Index: chrome/browser/prefs/incognito_user_pref_store.cc
diff --git a/chrome/browser/prefs/incognito_user_pref_store.cc b/chrome/browser/prefs/incognito_user_pref_store.cc
index 87bcb2c8870cbd6f2d2c94c5712b3a04e7dec84b..aba4e0d2f807dccec18839b5421fed3f5037f385 100644
--- a/chrome/browser/prefs/incognito_user_pref_store.cc
+++ b/chrome/browser/prefs/incognito_user_pref_store.cc
@@ -115,16 +115,6 @@ void IncognitoUserPrefStore::ReadPrefsAsync(
   OnInitializationCompleted(true);
 }
 
-bool IncognitoUserPrefStore::WritePrefs() {
-  // We do not write our content intentionally.
-  return true;
-}
-
-void IncognitoUserPrefStore::ScheduleWritePrefs() {
-  underlay_->ScheduleWritePrefs();
-  // We do not write our content intentionally.
-}
-
 void IncognitoUserPrefStore::CommitPendingWrite() {
   underlay_->CommitPendingWrite();
   // We do not write our content intentionally.