Remove some fx_dib functions with unused parameters.

core/fxge/agg/fx_agg_driver.cpp

Index: core/fxge/agg/fx_agg_driver.cpp
diff --git a/core/fxge/agg/fx_agg_driver.cpp b/core/fxge/agg/fx_agg_driver.cpp
index f5d7cbbf4cd8a9ea2d2c85f62848bf8f36e42f6b..c0111fc489a1cfe4bce8aea208b9b93f5f053da6 100644
--- a/core/fxge/agg/fx_agg_driver.cpp
+++ b/core/fxge/agg/fx_agg_driver.cpp
@@ -1729,7 +1729,7 @@ FX_BOOL CFX_AggDeviceDriver::GetDIBits(CFX_DIBitmap* pBitmap,
                                pBack, left, top);
   } else {
     bRet = pBitmap->TransferBitmap(0, 0, rect.Width(), rect.Height(), pBack,
-                                   left, top, nullptr);
+                                   left, top);
   }
   delete pBack;
   return bRet;