Don't try to remove extension-defined content settings when extensions are disabled.

chrome/browser/profiles/off_the_record_profile_impl.cc

Index: chrome/browser/profiles/off_the_record_profile_impl.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_impl.cc b/chrome/browser/profiles/off_the_record_profile_impl.cc
index fe99c67a296198c7444b3911c3d226627e72f31b..0e2f88c3508ddd2e68dc2a0b38012ed941fcfc79 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl.cc
+++ b/chrome/browser/profiles/off_the_record_profile_impl.cc
@@ -139,7 +139,7 @@ OffTheRecordProfileImpl::~OffTheRecordProfileImpl() {
     pref_proxy_config_tracker_->DetachFromPrefService();
 
   ExtensionService* extension_service = GetExtensionService();
-  if (extension_service) {
+  if (extension_service && extension_service->extensions_enabled()) {
     ExtensionPrefs* extension_prefs = extension_service->extension_prefs();
     extension_prefs->ClearIncognitoSessionOnlyContentSettings();
   }