Remove touch events from Sky

sky/engine/platform/PlatformEvent.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 47 matching lines @@
         GestureTapDown,
         GestureShowPress,
         GestureTapDownCancel,
         GestureTwoFingerTap,
         GestureLongPress,
         GestureLongTap,
         GesturePinchBegin,
         GesturePinchEnd,
         GesturePinchUpdate,
         GestureFlingStart,
-
-        // PlatformTouchEvent
-        TouchStart,
-        TouchMove,
-        TouchEnd,
-        TouchCancel,
     };
 
     enum Modifiers {
         AltKey      = 1 << 0,
         CtrlKey     = 1 << 1,
         MetaKey     = 1 << 2,
         ShiftKey    = 1 << 3,
     };
 
     Type type() const { return static_cast<Type>(m_type); }
@@ skipping 51 matching lines @@
     }
 
     unsigned m_type;
     unsigned m_modifiers;
     double m_timestamp;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PLATFORM_PLATFORMEVENT_H_