Enable incognito_session_only preferences

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/file_path.h"
@@ skipping 694 matching lines @@
     NotificationService::current()->Notify(
         NotificationType::OTR_PROFILE_CREATED,
         Source<Profile>(off_the_record_profile_.get()),
         NotificationService::NoDetails());
   }
   return off_the_record_profile_.get();
 }
 
 void ProfileImpl::DestroyOffTheRecordProfile() {
   off_the_record_profile_.reset();
+  extension_pref_value_map_->ClearAllIncognitoSessionOnlyPreferences();
 }
 
 bool ProfileImpl::HasOffTheRecordProfile() {
   return off_the_record_profile_.get() != NULL;
 }
 
 Profile* ProfileImpl::GetOriginalProfile() {
   return this;
 }
 
@@ skipping 921 matching lines @@
   if (!prerender::PrerenderManager::IsPrerenderingPossible())
     return NULL;
   if (!prerender_manager_.get()) {
     CHECK(g_browser_process->prerender_tracker());
     prerender_manager_.reset(
         new prerender::PrerenderManager(
             this, g_browser_process->prerender_tracker()));
   }
   return prerender_manager_.get();
 }