Cleanup env variable names

fpdfsdk/fpdfformfill.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 "public/fpdf_formfill.h"
 
 #include <memory>
 #include <vector>
@@ skipping 228 matching lines @@
   const int kRequiredVersion = 1;
 #endif  // PDF_ENABLE_XFA
   if (!formInfo || formInfo->version != kRequiredVersion)
     return nullptr;
 
   UnderlyingDocumentType* pDocument = UnderlyingFromFPDFDocument(document);
   if (!pDocument)
     return nullptr;
 
 #ifdef PDF_ENABLE_XFA
-  // If the CPDFXFA_Document has a SDKDocument already then we've done this
-  // and can just return the old Env. Otherwise, we'll end up setting a new
-  // SDKDocument into the XFADocument and, that could get weird.
+  // If the CPDFXFA_Document has a FormFillEnvironment already then we've done
+  // this and can just return the old Env. Otherwise, we'll end up setting a new
+  // environment into the XFADocument and, that could get weird.
   if (pDocument->GetFormFillEnv())
     return pDocument->GetFormFillEnv();
 #endif
 
   CPDFSDK_FormFillEnvironment* pFormFillEnv =
       new CPDFSDK_FormFillEnvironment(pDocument, formInfo);
 
 #ifdef PDF_ENABLE_XFA
   pDocument->SetFormFillEnv(pFormFillEnv);
   CPDFXFA_App::GetInstance()->AddFormFillEnv(pFormFillEnv);
@@ skipping 482 matching lines @@
                                     pFormFillEnv);
     }
   } else {
     if (aa.ActionExist(CPDF_AAction::ClosePage)) {
       CPDF_Action action = aa.GetAction(CPDF_AAction::ClosePage);
       pActionHandler->DoAction_Page(action, CPDF_AAction::ClosePage,
                                     pFormFillEnv);
     }
   }
 }