Incognito mode should use the original profile's webdata service.

chrome/browser/webdata/web_data_service_factory.cc

 // Copyright (c) 2012 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/webdata/web_data_service_factory.h"
 
 #include "base/file_path.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 22 matching lines @@
   return static_cast<WebDataService*>(
       GetInstance()->GetServiceForProfile(profile, false).get());
 }
 
 // static
 WebDataServiceFactory* WebDataServiceFactory::GetInstance() {
   return Singleton<WebDataServiceFactory>::get();
 }
 
 bool WebDataServiceFactory::ServiceRedirectedInIncognito() {
-  return false;
+  return true;
 }
 
 scoped_refptr<RefcountedProfileKeyedService>
 WebDataServiceFactory::BuildServiceInstanceFor(Profile* profile) const {
   DCHECK(profile);
 
   FilePath path = profile->GetPath();
   path = path.Append(chrome::kWebDataFilename);
 
   scoped_refptr<WebDataService> wds(new WebDataService());
   if (!wds->Init(profile->GetPath()))
     NOTREACHED();
   return wds.get();
 }
 
 bool WebDataServiceFactory::ServiceIsNULLWhileTesting() {
   return true;
 }