Remove custom memory manager

core/src/fxge/win32/fx_win32_dib.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_ge.h"
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ ||  _FX_OS_ == _FX_WIN64_
 #include <windows.h>
 #include "../../../include/fxge/fx_ge_win32.h"
@@ skipping 206 matching lines @@
             size += sizeof (FX_DWORD) * 254;
         }
         BITMAPINFO* pbmih = (BITMAPINFO*)FX_Alloc(FX_BYTE, size);
         if (!pbmih) {
             delete pDIBitmap;
             if (bCreatedDC) {
                 DeleteDC(hDC);
             }
             return NULL;
         }
-        FXSYS_memset32(pbmih, 0, sizeof (BITMAPINFOHEADER));
         pbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
         pbmih->bmiHeader.biBitCount = bmih.biBitCount;
         pbmih->bmiHeader.biCompression = BI_RGB;
         pbmih->bmiHeader.biHeight = -height;
         pbmih->bmiHeader.biPlanes = 1;
         pbmih->bmiHeader.biWidth = bmih.biWidth;
         if (!pDIBitmap->Create(bmih.biWidth, height, bmih.biBitCount == 1 ? FXDIB_1bppRgb : FXDIB_8bppRgb)) {
             delete pDIBitmap;
             FX_Free(pbmih);
             if (bCreatedDC) {
@@ skipping 63 matching lines @@
 }
 void CFX_WindowsDIB::LoadFromDevice(HDC hDC, int left, int top)
 {
     ::BitBlt(m_hMemDC, 0, 0, m_Width, m_Height, hDC, left, top, SRCCOPY);
 }
 void CFX_WindowsDIB::SetToDevice(HDC hDC, int left, int top)
 {
     ::BitBlt(hDC, left, top, m_Width, m_Height, m_hMemDC, 0, 0, SRCCOPY);
 }
 #endif