Introduce incognito preference settings.

chrome/browser/profiles/profile_impl.h

Index: chrome/browser/profiles/profile_impl.h
diff --git a/chrome/browser/profiles/profile_impl.h b/chrome/browser/profiles/profile_impl.h
index 3f9e53c5214484eb5830f00a232a50a6232e93dc..bb65c8d46999b4be5e218d232abb3c0954bd1718 100644
--- a/chrome/browser/profiles/profile_impl.h
+++ b/chrome/browser/profiles/profile_impl.h
@@ -20,6 +20,7 @@
 
 class BackgroundModeManager;
 class ExtensionPrefs;
+class ExtensionPrefValueMap;
 class PrefService;
 
 #if defined(OS_CHROMEOS)
@@ -146,6 +147,9 @@ class ProfileImpl : public Profile,
   // SpellCheckHostObserver implementation.
   virtual void SpellCheckHostInitialized();
 
+ protected:
+  virtual ExtensionPrefValueMap* GetExtensionPrefValueMap();
+
  private:
   friend class Profile;
 
@@ -174,6 +178,7 @@ class ProfileImpl : public Profile,
 
   FilePath path_;
   FilePath base_cache_path_;
+  scoped_ptr<ExtensionPrefValueMap> extension_pref_value_map_;
   // Keep prefs_ on top for destruction order because extension_prefs_,
   // net_pref_observer_, web_resource_service_ and background_contents_service_
   // store pointers to prefs_ and shall be destructed first.