Remove ref counting from CFWL_Event

xfa/fwl/core/ifwl_widget.cpp

 // 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
 
 #include "xfa/fwl/core/ifwl_widget.h"
 
 #include <algorithm>
 
@@ skipping 533 matching lines @@
   if (!pNoteDriver)
     return;
 
   pNoteDriver->UnregisterEventTarget(this);
 }
 
 void IFWL_Widget::DispatchKeyEvent(CFWL_MsgKey* pNote) {
   if (!pNote)
     return;
 
-  CFWL_EvtKey* pEvent = new CFWL_EvtKey;
+  auto pEvent = pdfium::MakeUnique<CFWL_EvtKey>();
   pEvent->m_pSrcTarget = this;
   pEvent->m_dwCmd = pNote->m_dwCmd;
   pEvent->m_dwKeyCode = pNote->m_dwKeyCode;
   pEvent->m_dwFlags = pNote->m_dwFlags;
-  DispatchEvent(pEvent);
-  pEvent->Release();
+  DispatchEvent(pEvent.get());
 }
 
 void IFWL_Widget::DispatchEvent(CFWL_Event* pEvent) {
   if (m_pOuter) {
     m_pOuter->GetDelegate()->OnProcessEvent(pEvent);
     return;
   }
   const IFWL_App* pApp = GetOwnerApp();
   if (!pApp)
     return;
@@ skipping 172 matching lines @@
     }
     default:
       break;
   }
 }
 
 void IFWL_Widget::OnProcessEvent(CFWL_Event* pEvent) {}
 
 void IFWL_Widget::OnDrawWidget(CFX_Graphics* pGraphics,
                                const CFX_Matrix* pMatrix) {}