Fix auto raw pointer deduction on linux

ui/message_center/views/message_list_view_unittest.cc

 // Copyright 2016 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 <map>
 #include <memory>
 #include <utility>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 154 matching lines @@
 void MessageListViewTest::UpdateNotificationSize(
     const std::string& notification_id) {
   // For this test, this method should not be invoked.
   NOTREACHED();
 }
 
 /* Unit tests *****************************************************************/
 
 TEST_F(MessageListViewTest, AddNotification) {
   // Create a dummy notification.
-  auto notification_view = CreateNotificationView(
+  auto* notification_view = CreateNotificationView(
       Notification(NOTIFICATION_TYPE_SIMPLE, std::string(kNotificationId1),
                    base::UTF8ToUTF16("title"), base::UTF8ToUTF16("message1"),
                    gfx::Image(), base::UTF8ToUTF16("display source"), GURL(),
                    NotifierId(NotifierId::APPLICATION, "extension_id"),
                    message_center::RichNotificationData(), nullptr));
 
   EXPECT_EQ(0, message_list_view()->child_count());
   EXPECT_FALSE(message_list_view()->Contains(notification_view));
 
   // Add a notification.
   message_list_view()->AddNotificationAt(notification_view, 0);
 
   EXPECT_EQ(1, message_list_view()->child_count());
   EXPECT_TRUE(message_list_view()->Contains(notification_view));
 }
 
 }  // namespace