Rename fpdfsdk/fpdfxfa files to match contents

fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.cpp

 // Copyright 2016 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/cpdfxfa_docenvironment.h"
 
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_stream_acc.h"
 #include "core/fpdfapi/parser/cpdf_string.h"
 #include "fpdfsdk/cpdfsdk_document.h"
 #include "fpdfsdk/cpdfsdk_environment.h"
 #include "fpdfsdk/cpdfsdk_interform.h"
 #include "fpdfsdk/cpdfsdk_pageview.h"
-#include "fpdfsdk/fpdfxfa/fpdfxfa_doc.h"
-#include "fpdfsdk/fpdfxfa/fpdfxfa_page.h"
+#include "fpdfsdk/fpdfxfa/cpdfxfa_document.h"
+#include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
 #include "fpdfsdk/javascript/ijs_runtime.h"
 #include "xfa/fxfa/xfa_ffdocview.h"
 #include "xfa/fxfa/xfa_ffwidget.h"
 #include "xfa/fxfa/xfa_ffwidgethandler.h"
 
 #define IDS_XFA_Validate_Input                                          \
   "At least one required field was empty. Please fill in the required " \
   "fields\r\n(highlighted) before continuing."
 
 // submit
@@ skipping 983 matching lines @@
   if (!m_pJSContext) {
     m_pDocument->GetSDKDoc()->GetEnv()->GetJSRuntime()->SetReaderDocument(
         m_pDocument->GetSDKDoc());
     m_pJSContext =
         m_pDocument->GetSDKDoc()->GetEnv()->GetJSRuntime()->NewContext();
   }
 
   return m_pDocument->GetSDKDoc()->GetEnv()->GetJSRuntime()->GetValueByName(
       szPropName, pValue);
 }