Remove FX_GAMMA() and friends. They do nothing.

core/fxge/include/fx_ge.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_FXGE_INCLUDE_FX_GE_H_
 #define CORE_FXGE_INCLUDE_FX_GE_H_
 
 #include "core/fxge/include/fx_dib.h"
@@ skipping 86 matching lines @@
 
  protected:
   ClipType m_Type;
 
   FX_RECT m_Box;
 
   CFX_DIBitmapRef m_Mask;
 
   void IntersectMaskRect(FX_RECT rect, FX_RECT mask_box, CFX_DIBitmapRef Mask);
 };
-#define FX_GAMMA(value) (value)
-#define FX_GAMMA_INVERSE(value) (value)
-inline FX_ARGB ArgbGamma(FX_ARGB argb) {
-  return argb;
-}
-inline FX_ARGB ArgbGammaInverse(FX_ARGB argb) {
-  return argb;
-}
+
 class CFX_PathData {
  public:
   CFX_PathData();
 
   CFX_PathData(const CFX_PathData& src);
 
   ~CFX_PathData();
 
   int GetPointCount() const { return m_PointCount; }
 
@@ skipping 577 matching lines @@
   void FindPSFontGlyph(CFX_FaceCache* pFaceCache,
                        CFX_Font* pFont,
                        const FXTEXT_CHARPOS& charpos,
                        int& ps_fontnum,
                        int& ps_glyphindex);
 
   void WritePSBinary(const uint8_t* data, int len);
 };
 
 #endif  // CORE_FXGE_INCLUDE_FX_GE_H_