Merge the CFWL_*Imp classes into the IFWL_* classes.

xfa/fwl/core/fwl_timerimp.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_adaptertimermgr.h"
-#include "xfa/fwl/core/ifwl_app.h"
-#include "xfa/fwl/core/ifwl_timer.h"
-#include "xfa/fxfa/xfa_ffapp.h"
-
-IFWL_TimerInfo* IFWL_Timer::StartTimer(uint32_t dwElapse, bool bImmediately) {
-  CXFA_FFApp* pAdapterNative = FWL_GetAdapterNative();
-  if (!pAdapterNative)
-    return nullptr;
-
-  IFWL_AdapterTimerMgr* pAdapterTimerMgr = pAdapterNative->GetTimerMgr();
-  if (!pAdapterTimerMgr)
-    return nullptr;
-
-  IFWL_TimerInfo* pTimerInfo = nullptr;
-  pAdapterTimerMgr->Start(this, dwElapse, bImmediately, &pTimerInfo);
-  return pTimerInfo;
-}
-
-FWL_Error IFWL_TimerInfo::StopTimer() {
-  CXFA_FFApp* pAdapterNative = FWL_GetAdapterNative();
-  if (!pAdapterNative)
-    return FWL_Error::Indefinite;
-
-  IFWL_AdapterTimerMgr* pAdapterTimerMgr = pAdapterNative->GetTimerMgr();
-  if (!pAdapterTimerMgr)
-    return FWL_Error::Indefinite;
-
-  return pAdapterTimerMgr->Stop(this);
-}