Merge to XFA: Fix ALL the include guards.

core/include/fxcodec/fx_codec.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 _FX_CODEC_H_
-#define _FX_CODEC_H_
-#ifndef _FXCRT_EXTENSION_
+#ifndef CORE_INCLUDE_FXCODEC_FX_CODEC_H_
+#define CORE_INCLUDE_FXCODEC_FX_CODEC_H_
+
 #include "../fxcrt/fx_ext.h"
-#endif
 #include "fx_codec_def.h"
 #include "fx_codec_provider.h"
+
 class CFX_DIBSource;
 class ICodec_ScanlineDecoder;
 class ICodec_ProgressiveDecoder;
 class ICodec_BasicModule;
 class ICodec_FaxModule;
 class ICodec_JpegModule;
 class ICodec_JpxModule;
 class ICodec_Jbig2Module;
 class ICodec_IccModule;
 class ICodec_FlateModule;
@@ skipping 437 matching lines @@
 
     FX_INT32            m_nBmpCompressType;
     class IFX_DIBAttributeExif* m_pExif;
 };
 class IFX_DIBAttributeExif
 {
 public:
     virtual ~IFX_DIBAttributeExif() {};
     virtual FX_BOOL             GetInfo(FX_WORD tag, FX_LPVOID val) = 0;
 };
-#endif
+
+#endif  // CORE_INCLUDE_FXCODEC_FX_CODEC_H_