Remove some fx_dib functions with unused parameters.

core/fxge/skia/fx_skia_device.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.
 
 #include "core/fxge/include/fx_ge.h"
 
 #if defined(_SKIA_SUPPORT_)
 #include <algorithm>
 #include <vector>
 
@@ skipping 920 matching lines @@
 }
 
 FX_BOOL CFX_SkiaDeviceDriver::GetDIBits(CFX_DIBitmap* pBitmap,
                                         int left,
                                         int top) {
   if (!m_pBitmap || !m_pBitmap->GetBuffer())
     return TRUE;
 
   FX_RECT rect(left, top, left + pBitmap->GetWidth(),
                top + pBitmap->GetHeight());
-  CFX_DIBitmap* pBack;
+  std::unique_ptr<CFX_DIBitmap> pBack;
   if (m_pOriDevice) {
-    pBack = m_pOriDevice->Clone(&rect);
+    pBack.reset(m_pOriDevice->Clone(&rect));
     if (!pBack)
       return TRUE;
 
     pBack->CompositeBitmap(0, 0, pBack->GetWidth(), pBack->GetHeight(),
                            m_pBitmap, 0, 0);
   } else {
-    pBack = m_pBitmap->Clone(&rect);
+    pBack.reset(m_pBitmap->Clone(&rect));
     if (!pBack)
       return TRUE;
   }
 
-  FX_BOOL bRet = TRUE;
   left = std::min(left, 0);
   top = std::min(top, 0);
   if (m_bRgbByteOrder) {
     RgbByteOrderTransferBitmap(pBitmap, 0, 0, rect.Width(), rect.Height(),
-                               pBack, left, top);
-  } else {
-    bRet = pBitmap->TransferBitmap(0, 0, rect.Width(), rect.Height(), pBack,
-                                   left, top, nullptr);
+                               pBack.get(), left, top);
+    return TRUE;
   }
-  delete pBack;
-  return bRet;
+
+  return pBitmap->TransferBitmap(0, 0, rect.Width(), rect.Height(), pBack.get(),
+                                 left, top);
 }
 
 CFX_DIBitmap* CFX_SkiaDeviceDriver::GetBackDrop() {
   return m_pOriDevice;
 }
 
 FX_BOOL CFX_SkiaDeviceDriver::SetDIBits(const CFX_DIBSource* pBitmap,
                                         uint32_t argb,
                                         const FX_RECT* pSrcRect,
                                         int left,
@@ skipping 281 matching lines @@
 
 FX_BOOL IFX_RenderDeviceDriver::DrawShading(const CPDF_ShadingPattern* pPattern,
                                             const CFX_Matrix* pMatrix,
                                             const FX_RECT& clip_rect,
                                             int alpha,
                                             FX_BOOL bAlphaMode) {
   return false;
 }
 
 #endif