Cleanup remaining IFWL files for visiblity and usage.

fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.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_FPDFXFA_CXFA_FWLADAPTERTIMERMGR_H_
 #define FPDFSDK_FPDFXFA_CXFA_FWLADAPTERTIMERMGR_H_
 
 #include <vector>
 
 #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
 #include "xfa/fwl/core/ifwl_adaptertimermgr.h"
 
 struct CFWL_TimerInfo;
 
 class CXFA_FWLAdapterTimerMgr : public IFWL_AdapterTimerMgr {
  public:
   CXFA_FWLAdapterTimerMgr(CPDFSDK_FormFillEnvironment* pFormFillEnv)
       : m_pFormFillEnv(pFormFillEnv) {}
 
-  FWL_Error Start(IFWL_Timer* pTimer,
-                  uint32_t dwElapse,
-                  bool bImmediately,
-                  IFWL_TimerInfo** pTimerInfo) override;
-  FWL_Error Stop(IFWL_TimerInfo* pTimerInfo) override;
+  void Start(IFWL_Timer* pTimer,
+             uint32_t dwElapse,
+             bool bImmediately,
+             IFWL_TimerInfo** pTimerInfo) override;
+  void Stop(IFWL_TimerInfo* pTimerInfo) override;
 
  protected:
   static void TimerProc(int32_t idEvent);
 
   static std::vector<CFWL_TimerInfo*>* s_TimerArray;
   CPDFSDK_FormFillEnvironment* const m_pFormFillEnv;
 };
 
 struct CFWL_TimerInfo : public IFWL_TimerInfo {
   CFWL_TimerInfo(IFWL_AdapterTimerMgr* mgr, int32_t event, IFWL_Timer* timer)
       : IFWL_TimerInfo(mgr), idEvent(event), pTimer(timer) {}
 
   int32_t idEvent;
   IFWL_Timer* pTimer;
 };
 
 #endif  // FPDFSDK_FPDFXFA_CXFA_FWLADAPTERTIMERMGR_H_