Fix use after free when handling async touch events

ui/views/widget/native_widget_win.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/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 766 matching lines @@
   return event.handled();
 }
 
 bool NativeWidgetWin::HandleUntranslatedKeyEvent(const ui::KeyEvent& event) {
   InputMethod* input_method = GetInputMethod();
   if (input_method)
     input_method->DispatchKeyEvent(event);
   return !!input_method;
 }
 
-bool NativeWidgetWin::HandleTouchEvent(const ui::TouchEvent& event) {
+void NativeWidgetWin::HandleTouchEvent(const ui::TouchEvent& event) {
   NOTREACHED() << "Touch events are not supported";
-  return false;
 }
 
 bool NativeWidgetWin::HandleIMEMessage(UINT message,
                                        WPARAM w_param,
                                        LPARAM l_param,
                                        LRESULT* result) {
   InputMethod* input_method = GetInputMethod();
   if (!input_method || input_method->IsMock()) {
     *result = 0;
     return false;
@@ skipping 233 matching lines @@
 // static
 bool NativeWidgetPrivate::IsTouchDown() {
   // This currently isn't necessary because we're not generating touch events on
   // windows.  When we do, this will need to be updated.
   return false;
 }
 
 }  // namespace internal
 
 }  // namespace views