Cleanup env variable names

fpdfsdk/fpdfxfa/cpdfxfa_document.cpp

Index: fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
index 8bb529aa54377cda9dbe095fa68d6863f46b4b86..df0da31beb1d304f5dcce1712970e618c03479ef 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
@@ -43,10 +43,10 @@ CPDFXFA_Document::~CPDFXFA_Document() {
   m_nLoadStatus = FXFA_LOADSTATUS_CLOSING;
 
   if (m_pFormFillEnv) {
-    m_pFormFillEnv->GetSDKDocument()->ClearAllFocusedAnnots();
-    // Once we're deleted the SDKDocument will point at a bad underlying
+    m_pFormFillEnv->ClearAllFocusedAnnots();
+    // Once we're deleted the FormFillEnvironment will point at a bad underlying
     // doc so we need to reset it ...
-    m_pFormFillEnv->GetSDKDocument()->ResetXFADocument();
+    m_pFormFillEnv->ResetXFADocument();
     m_pFormFillEnv = nullptr;
   }
 
@@ -201,5 +201,5 @@ void CPDFXFA_Document::RemovePage(CPDFXFA_Page* page) {
 
 void CPDFXFA_Document::ClearChangeMark() {
   if (m_pFormFillEnv)
-    m_pFormFillEnv->GetSDKDocument()->ClearChangeMark();
+    m_pFormFillEnv->ClearChangeMark();
 }