Disable ProfileKeyedServices on import process by default.

chrome/browser/content_settings/cookie_settings.h

 // 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.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_COOKIE_SETTINGS_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_COOKIE_SETTINGS_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 104 matching lines @@
 
    private:
     friend struct DefaultSingletonTraits<Factory>;
 
     Factory();
     virtual ~Factory();
 
     // |ProfileKeyedBaseFactory| methods:
     virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
     virtual bool ServiceRedirectedInIncognito() const OVERRIDE;
+    virtual bool ServiceIsNULLOnImportProcess() const OVERRIDE;
     virtual scoped_refptr<RefcountedProfileKeyedService>
         BuildServiceInstanceFor(Profile* profile) const OVERRIDE;
   };
 
  private:
   virtual ~CookieSettings();
 
   void OnBlockThirdPartyCookiesChanged();
 
   // Returns true if the "block third party cookies" preference is set.
   //
   // This method may be called on any thread.
   bool ShouldBlockThirdPartyCookies() const;
 
   scoped_refptr<HostContentSettingsMap> host_content_settings_map_;
   PrefChangeRegistrar pref_change_registrar_;
 
   // Used around accesses to |block_third_party_cookies_| to guarantee thread
   // safety.
   mutable base::Lock lock_;
 
   bool block_third_party_cookies_;
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_COOKIE_SETTINGS_H_