Don't delete obsolete prefs in incognito

components/content_settings/core/browser/content_settings_pref_provider.cc

Index: components/content_settings/core/browser/content_settings_pref_provider.cc
diff --git a/components/content_settings/core/browser/content_settings_pref_provider.cc b/components/content_settings/core/browser/content_settings_pref_provider.cc
index 3bd173ebe0a67a91629cbf1cd2735a0a8e17feb6..43738618351c6995cda3dc7c58269c655f3fc680 100644
--- a/components/content_settings/core/browser/content_settings_pref_provider.cc
+++ b/components/content_settings/core/browser/content_settings_pref_provider.cc
@@ -197,6 +197,8 @@ void PrefProvider::Notify(
 }
 
 void PrefProvider::DiscardObsoletePreferences() {
+  if (is_incognito_)
+    return;
   // These prefs were never stored on iOS/Android so they don't need to be
   // deleted.
 #if !defined(OS_IOS)