Fix auto raw pointer deduction on linux

ui/views/controls/scrollbar/overlay_scroll_bar.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 "ui/views/controls/scrollbar/overlay_scroll_bar.h"
 
 #include "base/macros.h"
 #include "cc/paint/paint_flags.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
@@ skipping 92 matching lines @@
     if (GetWidget())
       scroll_bar_->StartHideCountdown();
   } else {
     layer()->SetTransform(gfx::Transform());
     layer()->SetOpacity(kThumbHoverAlpha);
   }
 }
 
 OverlayScrollBar::OverlayScrollBar(bool horizontal)
     : BaseScrollBar(horizontal), hide_timer_(false, false) {
-  auto thumb = new Thumb(this);
+  auto* thumb = new Thumb(this);
   SetThumb(thumb);
   thumb->Init();
   set_notify_enter_exit_on_child(true);
   SetPaintToLayer();
   layer()->SetMasksToBounds(true);
   layer()->SetFillsBoundsOpaquely(false);
 }
 
 OverlayScrollBar::~OverlayScrollBar() {}
 
@@ skipping 47 matching lines @@
 
 void OverlayScrollBar::StartHideCountdown() {
   if (IsMouseHovered())
     return;
   hide_timer_.Start(
       FROM_HERE, base::TimeDelta::FromSeconds(1),
       base::Bind(&OverlayScrollBar::Hide, base::Unretained(this)));
 }
 
 }  // namespace views