Fix ALL the include guards.

core/include/fpdfapi/fpdf_render.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 _FPDF_RENDER_
-#define _FPDF_RENDER_
-#ifndef _FPDF_PAGE_
+#ifndef CORE_INCLUDE_FPDFAPI_FPDF_RENDER_H_
+#define CORE_INCLUDE_FPDFAPI_FPDF_RENDER_H_
+
+#include "../fxge/fx_ge.h"
 #include "fpdf_page.h"
-#endif
-#ifndef _FX_GE_H_
-#include "../fxge/fx_ge.h"
-#endif
+
 class CPDF_RenderContext;
 class CPDF_RenderOptions;
 class CPDF_ImageCache;
 class IPDF_OCContext;
 class CPDF_QuickStretcher;
 class CFX_PathData;
 class CFX_GraphStateData;
 class CFX_RenderDevice;
 class CPDF_TextObject;
 class CPDF_PathObject;
@@ skipping 283 matching lines @@
     FX_BOOL                             m_bCurFindCache;
 };
 class CPDF_RenderConfig 
 {
 public:
     CPDF_RenderConfig();
     ~CPDF_RenderConfig();
     int                                 m_HalftoneLimit;
     int                                 m_RenderStepLimit;
 };
-#endif
+
+#endif  // CORE_INCLUDE_FPDFAPI_FPDF_RENDER_H_