Introduce incognito preference settings.

chrome/browser/prefs/pref_change_registrar_unittest.cc

Index: chrome/browser/prefs/pref_change_registrar_unittest.cc
diff --git a/chrome/browser/prefs/pref_change_registrar_unittest.cc b/chrome/browser/prefs/pref_change_registrar_unittest.cc
index 2e4cd0e8425ef38c00ba824fddfb7a570508901a..a8c1eedff6c602022cac56984f3111c5901c6130 100644
--- a/chrome/browser/prefs/pref_change_registrar_unittest.cc
+++ b/chrome/browser/prefs/pref_change_registrar_unittest.cc
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "chrome/browser/extensions/extension_pref_store.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
+#include "chrome/browser/prefs/testing_pref_store.h"
 #include "chrome/common/notification_details.h"
 #include "chrome/common/notification_observer_mock.h"
 #include "chrome/common/notification_source.h"
@@ -20,7 +22,12 @@ namespace {
 // A mock provider that allows us to capture pref observer changes.
 class MockPrefService : public TestingPrefService {
  public:
-  MockPrefService() {}
+  MockPrefService()
+      : TestingPrefService(new TestingPrefStore(),
+                           new TestingPrefStore(),
+                           new ExtensionPrefStore(),
+                           new TestingPrefStore()) {
+  }
   virtual ~MockPrefService() {};
 
   MOCK_METHOD2(AddPrefObserver, void(const char*, NotificationObserver*));