Cleaning up nits in fwl/core files.

xfa/fwl/core/ifwl_checkbox.cpp

Index: xfa/fwl/core/ifwl_checkbox.cpp
diff --git a/xfa/fwl/core/ifwl_checkbox.cpp b/xfa/fwl/core/ifwl_checkbox.cpp
index 76a377acbf504d4c15a57239a0c9d910d4363c03..e309a35cd0dc3c351d6788bbf20968a16cd78202 100644
--- a/xfa/fwl/core/ifwl_checkbox.cpp
+++ b/xfa/fwl/core/ifwl_checkbox.cpp
@@ -374,9 +374,6 @@ void IFWL_CheckBox::OnProcessMessage(CFWL_Message* pMessage) {
     return;
 
   switch (pMessage->GetClassID()) {
-    case CFWL_MessageType::Activate:
-      OnActivate(pMessage);
-      break;
     case CFWL_MessageType::SetFocus:
       OnFocusChanged(pMessage, true);
       break;
@@ -421,11 +418,6 @@ void IFWL_CheckBox::OnDrawWidget(CFX_Graphics* pGraphics,
   DrawWidget(pGraphics, pMatrix);
 }
 
-void IFWL_CheckBox::OnActivate(CFWL_Message* pMsg) {
-  m_pProperties->m_dwStates &= ~FWL_WGTSTATE_Deactivated;
-  Repaint(&(m_rtClient));
-}
-
 void IFWL_CheckBox::OnFocusChanged(CFWL_Message* pMsg, bool bSet) {
   if (bSet)
     m_pProperties->m_dwStates |= FWL_WGTSTATE_Focused;