XFA: Fix a bunch of pointless returns.

xfa/src/fwl/src/basewidget/fwl_monthcalendarimp.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/src/foxitlib.h"
 #include "xfa/src/fwl/src/core/include/fwl_targetimp.h"
 #include "xfa/src/fwl/src/core/include/fwl_noteimp.h"
 #include "xfa/src/fwl/src/core/include/fwl_widgetimp.h"
@@ skipping 956 matching lines @@
       break;
     }
   }
   CFWL_WidgetImpDelegate::OnProcessMessage(pMessage);
   return iRet;
 }
 FWL_ERR CFWL_MonthCalendarImpDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
                                                     const CFX_Matrix* pMatrix) {
   return m_pOwner->DrawWidget(pGraphics, pMatrix);
 }
+
 void CFWL_MonthCalendarImpDelegate::OnActivate(CFWL_Message* pMsg) {
-  return;
 }
+
 void CFWL_MonthCalendarImpDelegate::OnFocusChanged(CFWL_Message* pMsg,
                                                    FX_BOOL bSet) {
   if (bSet) {
     m_pOwner->m_pProperties->m_dwStates |= FWL_WGTSTATE_Focused;
   } else {
     m_pOwner->m_pProperties->m_dwStates &= ~FWL_WGTSTATE_Focused;
   }
   m_pOwner->Repaint(&m_pOwner->m_rtClient);
 }
 void CFWL_MonthCalendarImpDelegate::OnLButtonDown(CFWL_MsgMouse* pMsg) {
@@ skipping 100 matching lines @@
   if (m_pOwner->m_iHovered > 0) {
     CFX_RectF rtInvalidate;
     rtInvalidate.Set(0, 0, 0, 0);
     m_pOwner->GetDayRect(m_pOwner->m_iHovered, rtInvalidate);
     m_pOwner->m_iHovered = -1;
     if (!rtInvalidate.IsEmpty()) {
       m_pOwner->Repaint(&rtInvalidate);
     }
   }
 }