Use MotionEvent::MAX_TOUCH_POINT_COUNT

ui/events/gestures/motion_event_aura.h

 // Copyright 2014 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 UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
 #define UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 51 matching lines @@
     float pressure;
     int source_device_id;
     float major_radius;
   };
 
   MotionEventAura(
       size_t pointer_count,
       const base::TimeTicks& last_touch_time,
       Action cached_action,
       int cached_action_index,
-      const PointData (&active_touches)[10/*TODO*/]);
+      const PointData (&active_touches)[MotionEvent::MAX_TOUCH_POINT_COUNT]);
 
   static PointData GetPointDataFromTouchEvent(const TouchEvent& touch);
   void AddTouch(const TouchEvent& touch);
   void UpdateTouch(const TouchEvent& touch);
   void UpdateCachedAction(const TouchEvent& touch);
   size_t GetIndexFromId(int id) const;
 
   size_t pointer_count_;
   base::TimeTicks last_touch_time_;
   Action cached_action_;
   // The index of the touch responsible for last ACTION_POINTER_DOWN or
   // ACTION_POINTER_UP. -1 if no such action has occurred.
   int cached_action_index_;
 
   // We want constant time indexing by pointer_index, and fast indexing by id.
-  PointData active_touches_[10/*TODO*/];
+  PointData active_touches_[MotionEvent::MAX_TOUCH_POINT_COUNT];
 
   DISALLOW_COPY_AND_ASSIGN(MotionEventAura);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_