Merge the CFWL_*Imp classes into the IFWL_* classes.

xfa/fwl/lightwidget/cfwl_edit.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 "xfa/fwl/lightwidget/cfwl_edit.h"
 
 #include <memory>
 #include <vector>
@@ skipping 162 matching lines @@
 FWL_Error CFWL_Edit::SetNumberRange(int32_t iMin, int32_t iMax) {
   if (iMin > iMax) {
     return FWL_Error::ParameterInvalid;
   }
   return GetWidget()->SetNumberRange(iMin, iMax);
 }
 
 FWL_Error CFWL_Edit::SetBackColor(uint32_t dwColor) {
   if (!GetWidget())
     return FWL_Error::Indefinite;
-  return GetWidget()->SetBackColor(dwColor);
+  return GetWidget()->SetBackgroundColor(dwColor);
 }
 
 FWL_Error CFWL_Edit::SetFont(const CFX_WideString& wsFont, FX_FLOAT fSize) {
   if (!GetWidget())
     return FWL_Error::Indefinite;
   return GetWidget()->SetFont(wsFont, fSize);
 }
 
 FX_BOOL CFWL_Edit::CanUndo() {
   return GetWidget()->CanUndo();
@@ skipping 37 matching lines @@
 }
 
 FX_BOOL CFWL_Edit::ReplaceSpellCheckWord(CFX_PointF pointf,
                                          const CFX_ByteStringC& bsReplace) {
   return GetWidget()->ReplaceSpellCheckWord(pointf, bsReplace);
 }
 
 CFWL_Edit::CFWL_Edit() {}
 
 CFWL_Edit::~CFWL_Edit() {}