Rewrite scoped_ptr<T>(NULL) to use the default ctor in ash/.

ash/wm/gestures/long_press_affordance_handler.cc

Index: ash/wm/gestures/long_press_affordance_handler.cc
diff --git a/ash/wm/gestures/long_press_affordance_handler.cc b/ash/wm/gestures/long_press_affordance_handler.cc
index 723e3923cda5d58d356253d2e0f6f4fd8cb2b8c4..d35c3f00a4f6895fc72d0434343390903d36e8f0 100644
--- a/ash/wm/gestures/long_press_affordance_handler.cc
+++ b/ash/wm/gestures/long_press_affordance_handler.cc
@@ -240,11 +240,9 @@ class LongPressAffordanceHandler::LongPressAffordanceView
 
 LongPressAffordanceHandler::LongPressAffordanceHandler()
     : ui::LinearAnimation(kAffordanceFrameRateHz, this),
-      view_(NULL),
       tap_down_touch_id_(-1),
       tap_down_display_id_(0),
-      current_animation_type_(NONE) {
-}
+      current_animation_type_(NONE) {}
 
 LongPressAffordanceHandler::~LongPressAffordanceHandler() {}