WIP: Pref service: use the incognito support from Chrome

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index 8c0106d22c58cb961a929607898d06aa722c1af5..06f02213d38dcce4ab6b75e9ba49556336ce8f77 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -41,6 +41,10 @@ namespace net {
 class SSLConfigService;
 }
 
+namespace sync_preferences {
+class PrefServiceSyncable;
+}
+
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
@@ -186,6 +190,9 @@ class Profile : public content::BrowserContext {
   // time that this method is called.
   virtual PrefService* GetOffTheRecordPrefs() = 0;
 
+  virtual sync_preferences::PrefServiceSyncable* CreateOffTheRecordPrefs(
+      service_manager::Connector* otr_connector);
+
   // Returns the main request context.
   virtual net::URLRequestContextGetter* GetRequestContext() = 0;