WIP: Pref service: use the incognito support from Chrome

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 f948a4d9978678937fb78ceb5058e916a9e53fdb..1fc26917c163bb1212d0a9f1d6ef1f20d3cc3611 100644
--- a/chrome/browser/profiles/profile_impl.h
+++ b/chrome/browser/profiles/profile_impl.h
@@ -37,6 +37,10 @@ class SupervisedUserTestBase;
 }
 #endif
 
+namespace sync_preferences {
+class PrefServiceSyncableFactory;
+}
+
 namespace base {
 class SequencedTaskRunner;
 }
@@ -121,6 +125,8 @@ class ProfileImpl : public Profile {
   const PrefService* GetPrefs() const override;
   ChromeZoomLevelPrefs* GetZoomLevelPrefs() override;
   PrefService* GetOffTheRecordPrefs() override;
+  sync_preferences::PrefServiceSyncable* CreateOffTheRecordPrefs(
+      service_manager::Connector* otr_connector) override;
   net::URLRequestContextGetter* GetRequestContext() override;
   net::URLRequestContextGetter* GetRequestContextForExtensions() override;
   net::SSLConfigService* GetSSLConfigService() override;
@@ -278,6 +284,8 @@ class ProfileImpl : public Profile {
 
   chrome_browser_net::Predictor* predictor_;
 
+  std::unique_ptr<sync_preferences::PrefServiceSyncableFactory> prefs_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };