Split fpdfsdk/fsdk_baseform.h into individual classes.

fpdfsdk/formfiller/cffl_checkbox.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 "fpdfsdk/formfiller/cffl_checkbox.h"
 
 #include "fpdfsdk/formfiller/cffl_formfiller.h"
+#include "fpdfsdk/include/cpdfsdk_widget.h"
 #include "fpdfsdk/include/fsdk_mgr.h"
 #include "fpdfsdk/pdfwindow/PWL_SpecialButton.h"
 #include "public/fpdf_fwlevent.h"
 
 CFFL_CheckBox::CFFL_CheckBox(CPDFDoc_Environment* pApp, CPDFSDK_Widget* pWidget)
     : CFFL_Button(pApp, pWidget) {}
 
 CFFL_CheckBox::~CFFL_CheckBox() {}
 
 CPWL_Wnd* CFFL_CheckBox::NewPDFWindow(const PWL_CREATEPARAM& cp,
@@ skipping 87 matching lines @@
           }
         }
       }
     }
 
     m_pWidget->SetCheck(bNewChecked, false);
     m_pWidget->UpdateField();
     SetChangeMark();
   }
 }