Remove another potential stale CJS_Timer usage

fpdfsdk/javascript/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 FPDFSDK_JAVASCRIPT_APP_H_
 #define FPDFSDK_JAVASCRIPT_APP_H_
 
 #include <memory>
 #include <vector>
 
 #include "fpdfsdk/javascript/JS_Define.h"
 
 class CJS_Runtime;
 class CJS_Timer;
 
 class TimerObj : public CJS_EmbedObj {
  public:
   TimerObj(CJS_Object* pJSObject);
   ~TimerObj() override;
 
- public:
   void SetTimer(CJS_Timer* pTimer);
-  CJS_Timer* GetTimer() const;
+  int GetTimerID() const { return m_nTimerID; }
 
  private:
-  CJS_Timer* m_pTimer;
+  int m_nTimerID;  // Weak reference to timer through global map.
 };
 
 class CJS_TimerObj : public CJS_Object {
  public:
   CJS_TimerObj(v8::Local<v8::Object> pObject) : CJS_Object(pObject) {}
   ~CJS_TimerObj() override {}
 
   DECLARE_JS_CLASS();
 };
 
@@ skipping 112 matching lines @@
   FX_BOOL setTimeOut(IJS_Context* cc,
                      const std::vector<CJS_Value>& params,
                      CJS_Value& vRet,
                      CFX_WideString& sError);
 
   static CFX_WideString SysPathToPDFPath(const CFX_WideString& sOldPath);
 
  private:
   // CJS_EmbedObj
   void TimerProc(CJS_Timer* pTimer) override;
+  void CancelProc(CJS_Timer* pTimer) override;
   void RunJsScript(CJS_Runtime* pRuntime, const CFX_WideString& wsScript);
 
   void ClearTimerCommon(const CJS_Value& param);
 
   bool m_bCalculate;
   bool m_bRuntimeHighLight;
   std::vector<std::unique_ptr<CJS_Timer>> m_Timers;
 };
 
 class CJS_App : public CJS_Object {
@@ skipping 33 matching lines @@
   JS_STATIC_METHOD(openDoc, app);
   JS_STATIC_METHOD(openFDF, app);
   JS_STATIC_METHOD(popUpMenuEx, app);
   JS_STATIC_METHOD(popUpMenu, app);
   JS_STATIC_METHOD(response, app);
   JS_STATIC_METHOD(setInterval, app);
   JS_STATIC_METHOD(setTimeOut, app);
 };
 
 #endif  // FPDFSDK_JAVASCRIPT_APP_H_