Fix a bunch of IWYU violators that don't include scoped_ptr.h

ash/wm/gestures/long_press_affordance_handler.h

 // 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.
 
 #ifndef ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
 #define ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/timer/timer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace ui {
 class GestureEvent;
 }
 
 namespace ash {
@@ skipping 45 matching lines @@
   base::OneShotTimer timer_;
   aura::Window* tap_down_target_;
   LongPressAnimationType current_animation_type_;
 
   DISALLOW_COPY_AND_ASSIGN(LongPressAffordanceHandler);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_