Fix use after free when handling async touch events

ui/views/widget/desktop_aura/desktop_root_window_host_win.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_WIN_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_WIN_H_
 
 #include "ui/aura/client/animation_host.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/views/views_export.h"
@@ skipping 160 matching lines @@
   virtual void HandleWorkAreaChanged() OVERRIDE;
   virtual void HandleVisibilityChanging(bool visible) OVERRIDE;
   virtual void HandleVisibilityChanged(bool visible) OVERRIDE;
   virtual void HandleClientSizeChanged(const gfx::Size& new_size) OVERRIDE;
   virtual void HandleFrameChanged() OVERRIDE;
   virtual void HandleNativeFocus(HWND last_focused_window) OVERRIDE;
   virtual void HandleNativeBlur(HWND focused_window) OVERRIDE;
   virtual bool HandleMouseEvent(const ui::MouseEvent& event) OVERRIDE;
   virtual bool HandleKeyEvent(const ui::KeyEvent& event) OVERRIDE;
   virtual bool HandleUntranslatedKeyEvent(const ui::KeyEvent& event) OVERRIDE;
-  virtual bool HandleTouchEvent(const ui::TouchEvent& event) OVERRIDE;
+  virtual void HandleTouchEvent(const ui::TouchEvent& event) OVERRIDE;
   virtual bool HandleIMEMessage(UINT message,
                                 WPARAM w_param,
                                 LPARAM l_param,
                                 LRESULT* result) OVERRIDE;
   virtual void HandleInputLanguageChange(DWORD character_set,
                                          HKL input_language_id) OVERRIDE;
   virtual bool HandlePaintAccelerated(const gfx::Rect& invalid_rect) OVERRIDE;
   virtual void HandlePaint(gfx::Canvas* canvas) OVERRIDE;
   virtual bool HandleTooltipNotify(int w_param,
                                    NMHDR* l_param,
@@ skipping 62 matching lines @@
   // rather than asking the Widget for the non_client_view so that we know at
   // Init time, before the Widget has created the NonClientView.
   bool has_non_client_view_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopRootWindowHostWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_WIN_H_