Use a direct include of strings headers in ui/, part 2.

ui/message_center/notification_list_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/message_center/notification_list.h"
 
 #include "base/basictypes.h"
 #include "base/i18n/time_formatting.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/notification_types.h"
 
 namespace message_center {
 namespace test {
 
 class NotificationListTest : public testing::Test {
@@ skipping 571 matching lines @@
   notification_list()->SetQuietMode(false);
   AddNotification(NULL);
   EXPECT_EQ(4u, notification_list()->NotificationCount());
   EXPECT_EQ(1u, GetPopupCounts());
 
   // TODO(mukai): Add test of quiet mode with expiration.
 }
 
 }  // namespace test
 }  // namespace message_center