pdfium: Fix all -Wdelete-non-virtual-dtor violations on Mac.

core/include/fpdfapi/fpdf_parser.h

Index: core/include/fpdfapi/fpdf_parser.h
diff --git a/core/include/fpdfapi/fpdf_parser.h b/core/include/fpdfapi/fpdf_parser.h
index c6c80778a138b888b81d9bf64d3d8db508d08a40..feac6c67dca8e734bfabf028886d7decaf32ceae 100644
--- a/core/include/fpdfapi/fpdf_parser.h
+++ b/core/include/fpdfapi/fpdf_parser.h
@@ -397,7 +397,7 @@ public:
 #define PDFPARSE_ERROR_PASSWORD		3
 #define PDFPARSE_ERROR_HANDLER		4
 #define PDFPARSE_ERROR_CERT			5
-class CPDF_Parser : public IPDF_DocParser
+class CPDF_Parser FX_FINAL : public IPDF_DocParser
 {
 public:
 
@@ -945,7 +945,7 @@ enum PDF_DATAAVAIL_STATUS {
     PDF_DATAAVAIL_LOADALLFILE,
     PDF_DATAAVAIL_TRAILER_APPEND
 };
-class CPDF_DataAvail : public CFX_Object, public IPDF_DataAvail
+class CPDF_DataAvail FX_FINAL : public CFX_Object, public IPDF_DataAvail
 {
 public: