aura-touch: Refactor some code so that both cros and win-aura can share some code.

content/browser/renderer_host/web_input_event_aurawin.cc

 // 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.
 
 #include "content/browser/renderer_host/web_input_event_aura.h"
 
 #include "base/event_types.h"
 #include "base/logging.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/win/WebInputEventFactory.h"
 
@@ skipping 26 matching lines @@
                                                      native_event.lParam);
 }
 
 WebKit::WebGestureEvent MakeWebGestureEventFromNativeEvent(
     base::NativeEvent native_event) {
   // TODO: Create gestures from native event.
   NOTIMPLEMENTED();
   return  WebKit::WebGestureEvent();
 }
 
-WebKit::WebTouchPoint* UpdateWebTouchEventFromNativeEvent(
-    base::NativeEvent native_event, WebKit::WebTouchEvent* web_event) {
-  NOTIMPLEMENTED();
-  return NULL;
-}
-
 }  // namespace content