Remove PDF XFA shutdown workaround.

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index 36790be7d350bc210cfa797b87a3a27c58b5f6f6..37c01618778ebd942421fbab1c4c6f6b8a3affcf 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -780,16 +780,8 @@ PDFiumEngine::~PDFiumEngine() {
 
   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_);
 }