Rename fpdfsdk/fpdfxfa files to match contents

fpdfsdk/fpdfxfa/cpdfxfa_app.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 "fpdfsdk/fpdfxfa/fpdfxfa_app.h"
+#include "fpdfsdk/fpdfxfa/cpdfxfa_app.h"
 
 #include <memory>
 
 #include "fpdfsdk/cpdfsdk_environment.h"
-#include "fpdfsdk/fpdfxfa/fpdfxfa_util.h"
+#include "fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h"
 #include "fpdfsdk/fsdk_define.h"
 #include "third_party/base/ptr_util.h"
 #include "xfa/fxbarcode/BC_Library.h"
 #include "xfa/fxfa/xfa_ffapp.h"
 #include "xfa/fxfa/xfa_fontmgr.h"
 
 namespace {
 
 CPDFXFA_App* g_pApp = nullptr;
 
@@ skipping 309 matching lines @@
   }
 }
 
 IFWL_AdapterTimerMgr* CPDFXFA_App::GetTimerMgr() {
   CXFA_FWLAdapterTimerMgr* pAdapter = nullptr;
   CPDFSDK_Environment* pEnv = m_pEnvList.GetAt(0);
   if (pEnv)
     pAdapter = new CXFA_FWLAdapterTimerMgr(pEnv);
   return pAdapter;
 }