XFA: Fix DOS newlines

xfa/include/fwl/lightwidget/app.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef FWL_LIGHTWIDGET_APP_H_
 #define FWL_LIGHTWIDGET_APP_H_
 
 class CFWL_Theme;
 class IFWL_App;
 
 class CFWL_App {
  public:
   CFWL_App();
   virtual ~CFWL_App();
 
   FWL_ERR Initialize();
   FWL_ERR Exit(int32_t iExitCode);
 
   CFWL_Theme* GetTheme() const { return m_pTheme; }
   IFWL_App* GetInterface() const { return m_pIface; }
 
  private:
   IFWL_App* m_pIface;
   CFWL_Theme* m_pTheme;
 };
 #endif  // FWL_LIGHTWIDGET_APP_H_