Update local BaseScrollBar::contents_scroll_offset_ on Update.

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/message_loop.h"
 #include "ui/events/event.h"
+#include "ui/views/controls/scrollbar/native_scroll_bar_views.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 {
 
 // static
 const char NativeScrollBar::kViewClassName[] = "NativeScrollBar";
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeScrollBar, public:
 NativeScrollBar::NativeScrollBar(bool is_horizontal)
     : ScrollBar(is_horizontal),
       native_wrapper_(NULL) {
@@ skipping 79 matching lines @@
 }
 
 int NativeScrollBar::GetPosition() const {
   if (!native_wrapper_)
     return 0;
   return native_wrapper_->GetPosition();
 }
 
 }  // namespace views