Remove duplicate NotificationObserver mock.

chrome/browser/password_manager/password_store_x_unittest.cc

Index: chrome/browser/password_manager/password_store_x_unittest.cc
diff --git a/chrome/browser/password_manager/password_store_x_unittest.cc b/chrome/browser/password_manager/password_store_x_unittest.cc
index 837960099fbf4b7e4cf7675a7918594c167977ce..eb9f5b34580064fb1ad018beb73955ab1435705e 100644
--- a/chrome/browser/password_manager/password_store_x_unittest.cc
+++ b/chrome/browser/password_manager/password_store_x_unittest.cc
@@ -12,9 +12,9 @@
 #include "chrome/browser/password_manager/password_store_change.h"
 #include "chrome/browser/password_manager/password_store_x.h"
 #include "chrome/browser/webdata/web_data_service.h"
+#include "chrome/common/notification_observer_mock.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/pref_names.h"
-#include "chrome/test/mock_notification_observer.h"
 #include "chrome/test/signaling_task.h"
 #include "chrome/test/testing_profile.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -67,7 +67,7 @@ class DBThreadObserverHelper
     registrar_.RemoveAll();
   }
 
-  MockNotificationObserver& observer() {
+  NotificationObserverMock& observer() {
     return observer_;
   }
 
@@ -84,7 +84,7 @@ class DBThreadObserverHelper
 
   WaitableEvent done_event_;
   NotificationRegistrar registrar_;
-  MockNotificationObserver observer_;
+  NotificationObserverMock observer_;
 };
 
 class FailingBackend : public PasswordStoreX::NativeBackend {