Remove a few unused variables, functions, and tables.

core/src/fxge/dib/fx_dib_main.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 "../../../include/fxge/fx_dib.h"
 #include "../../../include/fxge/fx_ge.h"
 #include "../../../include/fxcodec/fx_codec.h"
 #include "dib_int.h"
@@ skipping 429 matching lines @@
     }
     ASSERT(HasAlpha() && (m_bpp >= 24));
     ASSERT(pMask->IsAlphaMask());
     if (!HasAlpha() || !pMask->IsAlphaMask() || m_bpp < 24) {
         return FALSE;
     }
     GetOverlapRect(dest_left, dest_top, width, height, pMask->GetWidth(), pMask->GetHeight(), src_left, src_top, NULL);
     if (width == 0 || height == 0) {
         return TRUE;
     }
-    int src_pitch = pMask->GetPitch();
     int src_bpp = pMask->GetBPP();
     int alpha;
     FX_DWORD dst_color;
     if (alpha_flag >> 8) {
         alpha = alpha_flag & 0xff;
         dst_color = FXCMYK_TODIB(color);
     } else {
         alpha = FXARGB_A(color);
         dst_color = FXARGB_TODIB(color);
     }
@@ skipping 1264 matching lines @@
     if (!m_pBitmap->Create(width, height, src_format)) {
         delete m_pBitmap;
         m_pBitmap = NULL;
         return FALSE;
     }
     if (pSrcPalette) {
         m_pBitmap->CopyPalette(pSrcPalette);
     }
     return TRUE;
 }