Fixup incorrect include guards.

core/src/fxcodec/lgif/fx_gif.h

 // 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
 
+#ifndef CORE_SRC_FXCODEC_LGIF_FX_GIF_H_
+#define CORE_SRC_FXCODEC_LGIF_FX_GIF_H_
+
 #include <setjmp.h>
 
 #include "core/include/fxcrt/fx_basic.h"
 
 extern FX_WORD _GetWord_LSBFirst(uint8_t* p);
 extern void _SetWord_LSBFirst(uint8_t* p, FX_WORD v);
 extern void _BpcConvert(const uint8_t* src_buf,
                         FX_DWORD src_len,
                         int32_t src_bpc,
                         int32_t dst_bpc,
@@ skipping 274 matching lines @@
 #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION
   GifGCE* gce_ptr;
 #endif
 
 #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION
   GifPTE* pte_ptr;
   const uint8_t* pte_data_ptr;
   FX_DWORD pte_data_len;
 #endif
 };
+
 void _gif_error(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg);
 void _gif_warn(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg);
 gif_decompress_struct_p _gif_create_decompress();
 void _gif_destroy_decompress(gif_decompress_struct_pp gif_ptr_ptr);
 gif_compress_struct_p _gif_create_compress();
 void _gif_destroy_compress(gif_compress_struct_pp gif_ptr_ptr);
 int32_t _gif_read_header(gif_decompress_struct_p gif_ptr);
 int32_t _gif_get_frame(gif_decompress_struct_p gif_ptr);
 int32_t _gif_get_frame_num(gif_decompress_struct_p gif_ptr);
 int32_t _gif_decode_extension(gif_decompress_struct_p gif_ptr);
@@ skipping 12 matching lines @@
                               uint8_t** avial_buf_ptr);
 void interlace_buf(const uint8_t* buf, FX_DWORD width, FX_DWORD height);
 FX_BOOL _gif_encode(gif_compress_struct_p gif_ptr,
                     uint8_t*& dst_buf,
                     FX_DWORD& dst_len);
 #define GIF_PTR_NOT_NULL(ptr, gif_ptr)    \
   if (ptr == NULL) {                      \
     _gif_error(gif_ptr, "Out Of Memory"); \
     return 0;                             \
   }
+
+#endif  // CORE_SRC_FXCODEC_LGIF_FX_GIF_H_