Remove auto raw pointer deduction from non-linux specific code.

ash/system/chromeos/screen_layout_observer_unittest.cc

 // Copyright 2013 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 "ash/system/chromeos/screen_layout_observer.h"
 
 #include "ash/common/strings/grit/ash_strings.h"
 #include "ash/common/system/chromeos/devicetype_utils.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/test/test_system_tray_delegate.h"
@@ skipping 76 matching lines @@
 
 base::string16 ScreenLayoutObserverTest::GetMirroringDisplayName() {
   return base::UTF8ToUTF16(display_manager()->GetDisplayNameForId(
       display_manager()->mirroring_display_id()));
 }
 
 const message_center::Notification*
 ScreenLayoutObserverTest::GetDisplayNotification() const {
   const message_center::NotificationList::Notifications notifications =
       message_center::MessageCenter::Get()->GetVisibleNotifications();
-  for (const auto& notification : notifications) {
+  for (auto* notification : notifications) {
     if (notification->id() == ScreenLayoutObserver::kNotificationId)
       return notification;
   }
 
   return nullptr;
 }
 
 TEST_F(ScreenLayoutObserverTest, DisplayNotifications) {
   Shell::GetInstance()
       ->screen_layout_observer()
@@ skipping 326 matching lines @@
   display_manager()->SetLayoutForCurrentDisplays(builder.Build());
   EXPECT_TRUE(GetDisplayNotificationText().empty());
 
   // Close the lid. We go to docked mode, but we show no notifications.
   UpdateDisplay("400x400");
   EXPECT_TRUE(GetDisplayNotificationText().empty());
   EXPECT_TRUE(GetDisplayNotificationAdditionalText().empty());
 }
 
 }  // namespace ash