use enum to specify deviceSource for fling animation

public/platform/Platform.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 576 matching lines @@
     virtual bool canAccelerate2dCanvas() { return false; }
 
     virtual bool isThreadedCompositingEnabled() { return false; }
 
     virtual WebCompositorSupport* compositorSupport() { return 0; }
 
     virtual WebFlingAnimator* createFlingAnimator() { return 0; }
 
     // Creates a new fling animation curve instance for device |deviceSource|
     // with |velocity| and already scrolled |cumulativeScroll| pixels.
-    virtual WebGestureCurve* createFlingAnimationCurve(int deviceSource, const WebFloatPoint& velocity, const WebSize& cumulativeScroll) { return 0; }
-
-    // TODO(rjkroege): Remove at end of http://crbug.com/343327
-    virtual WebGestureCurve* createFlingAnimationCurve(
-        WebGestureDevice deviceSource,
-        const WebFloatPoint& velocity,
-        const WebSize& cumulativeScroll)
-    {
-        return createFlingAnimationCurve(
-            (int)deviceSource, velocity, cumulativeScroll);
-    }
+    virtual WebGestureCurve* createFlingAnimationCurve(WebGestureDevice deviceSource, const WebFloatPoint& velocity, const WebSize& cumulativeScroll) { return 0; }
 
     // WebRTC ----------------------------------------------------------
 
     // Creates an WebRTCPeerConnectionHandler for RTCPeerConnection.
     // May return null if WebRTC functionality is not avaliable or out of resources.
     virtual WebRTCPeerConnectionHandler* createRTCPeerConnectionHandler(WebRTCPeerConnectionHandlerClient*) { return 0; }
 
     // May return null if WebRTC functionality is not avaliable or out of resources.
     virtual WebMediaStreamCenter* createMediaStreamCenter(WebMediaStreamCenterClient*) { return 0; }
 
@@ skipping 56 matching lines @@
     virtual WebDatabaseObserver* databaseObserver() { return 0; }
 
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace blink
 
 #endif