views: Remove dependency on ui::TouchEvent/GestureEvent from views.

ui/views/events/event_aura.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 "ui/views/events/event.h"
 
 #include "base/logging.h"
 #include "ui/base/event.h"
 #include "ui/base/keycodes/keyboard_code_conversion.h"
 
@@ skipping 38 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // GestureEvent, public:
 
 GestureEvent::GestureEvent(const NativeEvent& event)
     : LocatedEvent(event),
       details_(static_cast<ui::GestureEventImpl*>(event)->details()) {
 }
 
-int GestureEvent::GetLowestTouchId() const {
-  return native_event() ?  static_cast<ui::GestureEventImpl*>(
-      native_event())->GetLowestTouchId() : 0;
-}
-
 }  // namespace views