Remove fgas_base.h and IWYU

xfa/src/fgas/src/xml/fx_sax_imp.cpp

Index: xfa/src/fgas/src/xml/fx_sax_imp.cpp
diff --git a/xfa/src/fgas/src/xml/fx_sax_imp.cpp b/xfa/src/fgas/src/xml/fx_sax_imp.cpp
index 679df907f29d6bfec45394f826d803bc0d5d3140..251af01a065fcc45846af06464dbf406f847f13c 100644
--- a/xfa/src/fgas/src/xml/fx_sax_imp.cpp
+++ b/xfa/src/fgas/src/xml/fx_sax_imp.cpp
@@ -4,11 +4,10 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include <algorithm>
-
-#include "xfa/src/fgas/src/fgas_base.h"
 #include "xfa/src/fgas/src/xml/fx_sax_imp.h"
 
+#include <algorithm>
+
 namespace {
 
 const FX_DWORD kSaxFileBufSize = 32768;