Move NotificationDelegate into message_center.

ui/message_center/notification_delegate.cc

Index: ui/message_center/notification_delegate.cc
diff --git a/base/time/clock.cc b/ui/message_center/notification_delegate.cc
similarity index 50%
copy from base/time/clock.cc
copy to ui/message_center/notification_delegate.cc
index 34dc37e38b53fb6f08324d78b53eda418732f598..6f0ae5de33a06c55c7a2f547ae0baf1944e71589 100644
--- a/base/time/clock.cc
+++ b/ui/message_center/notification_delegate.cc
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/time/clock.h"
+#include "ui/message_center/notification_delegate.h"
 
-namespace base {
+namespace message_center {
 
-Clock::~Clock() {}
+void NotificationDelegate::ButtonClick(int button_index) {}
 
-}  // namespace base
+}  // namespace message_center