Merge IFWL and CFWL classes.

xfa/fwl/core/cfwl_timer.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 XFA_FWL_CORE_CFWL_TIMER_H_
 #define XFA_FWL_CORE_CFWL_TIMER_H_
 
 #include "core/fxcrt/fx_system.h"
 
 class CFWL_TimerInfo;
-class IFWL_Widget;
+class CFWL_Widget;
 
 class CFWL_Timer {
  public:
-  explicit CFWL_Timer(IFWL_Widget* parent) : m_pWidget(parent) {}
+  explicit CFWL_Timer(CFWL_Widget* parent) : m_pWidget(parent) {}
   virtual ~CFWL_Timer() {}
 
   virtual void Run(CFWL_TimerInfo* hTimer) = 0;
   CFWL_TimerInfo* StartTimer(uint32_t dwElapse, bool bImmediately);
 
  protected:
-  IFWL_Widget* m_pWidget;  // Not owned.
+  CFWL_Widget* m_pWidget;  // Not owned.
 };
 
 #endif  // XFA_FWL_CORE_CFWL_TIMER_H_