Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_tooltip.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/core/ifwl_tooltip.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
@@ skipping 14 matching lines @@
       m_pTimerInfoHide(nullptr) {
   m_rtClient.Set(0, 0, 0, 0);
   m_rtCaption.Set(0, 0, 0, 0);
   m_rtAnchor.Set(0, 0, 0, 0);
   m_TimerShow.m_pToolTip = this;
   m_TimerHide.m_pToolTip = this;
 }
 
 IFWL_ToolTip::~IFWL_ToolTip() {}
 
-FWL_Error IFWL_ToolTip::GetClassName(CFX_WideString& wsClass) const {
-  wsClass = FWL_CLASS_ToolTip;
-  return FWL_Error::Succeeded;
-}
-
 FWL_Type IFWL_ToolTip::GetClassID() const {
   return FWL_Type::ToolTip;
 }
 
 FWL_Error IFWL_ToolTip::Initialize() {
   m_pProperties->m_dwStyles |= FWL_WGTSTYLE_Popup;
   m_pProperties->m_dwStyles &= ~FWL_WGTSTYLE_Child;
   if (IFWL_Widget::Initialize() != FWL_Error::Succeeded)
     return FWL_Error::Indefinite;
 
   m_pDelegate = new CFWL_ToolTipImpDelegate(this);
   return FWL_Error::Succeeded;
 }
 
-FWL_Error IFWL_ToolTip::Finalize() {
+void IFWL_ToolTip::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
-  return IFWL_Widget::Finalize();
+  IFWL_Widget::Finalize();
 }
 
 FWL_Error IFWL_ToolTip::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {
   if (bAutoSize) {
     rect.Set(0, 0, 0, 0);
     if (!m_pProperties->m_pThemeProvider) {
       m_pProperties->m_pThemeProvider = GetAvailableTheme();
     }
     CFX_WideString wsCaption;
     IFWL_ToolTipDP* pData =
@@ skipping 203 matching lines @@
 void CFWL_ToolTipImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   CFWL_WidgetImpDelegate::OnProcessMessage(pMessage);
 }
 
 void CFWL_ToolTipImpDelegate::OnProcessEvent(CFWL_Event* pEvent) {}
 
 void CFWL_ToolTipImpDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
                                            const CFX_Matrix* pMatrix) {
   m_pOwner->DrawWidget(pGraphics, pMatrix);
 }