Remove PDF XFA shutdown workaround.

pdf/pdfium/pdfium_engine.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 762 matching lines @@
     g_last_instance_id = instance->pp_instance();
 #endif
 }
 
 PDFiumEngine::~PDFiumEngine() {
   for (auto& page : pages_)
     page->Unload();
 
   if (doc_) {
     FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_WC);
-
-#if defined(PDF_ENABLE_XFA)
-    // XFA may require |form_| to outlive |doc_|, so shut down in that order.
-    FPDF_CloseDocument(doc_);
-    FPDFDOC_ExitFormFillEnvironment(form_);
-#else
-    // Normally |doc_| should outlive |form_|.
     FPDFDOC_ExitFormFillEnvironment(form_);
     FPDF_CloseDocument(doc_);
-#endif
   }
   FPDFAvail_Destroy(fpdf_availability_);
 }
 
 #if defined(PDF_ENABLE_XFA)
 
 void PDFiumEngine::Form_EmailTo(FPDF_FORMFILLINFO* param,
                                 FPDF_FILEHANDLER* file_handler,
                                 FPDF_WIDESTRING to,
                                 FPDF_WIDESTRING subject,
@@ skipping 3339 matching lines @@
   FPDF_DOCUMENT doc =
       FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf