Use a direct include of the message_loop header in ui/, part 2.

ui/views/controls/scrollbar/native_scroll_bar.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/views/controls/scrollbar/native_scroll_bar.h"
 
 #include <algorithm>
 #include <string>
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "ui/base/events/event.h"
 #include "ui/views/controls/scrollbar/native_scroll_bar_wrapper.h"
 #include "ui/views/widget/widget.h"
 
 #if defined(USE_AURA)
 #include "ui/views/controls/scrollbar/native_scroll_bar_views.h"
 #endif
 
 namespace views {
 
@@ skipping 87 matching lines @@
 }
 
 int NativeScrollBar::GetPosition() const {
   if (!native_wrapper_)
     return 0;
   return native_wrapper_->GetPosition();
 }
 
 }  // namespace views