Remove fgas_base.h and IWYU

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

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
+#include "xfa/src/fgas/src/xml/fx_sax_imp.h"
+
 #include <algorithm>
 
-#include "xfa/src/fgas/src/fgas_base.h"
-#include "xfa/src/fgas/src/xml/fx_sax_imp.h"
-
 namespace {
 
 const FX_DWORD kSaxFileBufSize = 32768;
 
 }  // namespace
 
 IFX_SAXReader* FX_SAXReader_Create() {
   return new CFX_SAXReader;
 }
 CFX_SAXFile::CFX_SAXFile()
@@ skipping 658 matching lines @@
 }
 void CFX_SAXReader::SkipCurrentNode() {
   if (!m_pCurItem) {
     return;
   }
   m_pCurItem->m_bSkip = TRUE;
 }
 void CFX_SAXReader::SetHandler(IFX_SAXReaderHandler* pHandler) {
   m_pHandler = pHandler;
 }