Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_scrollbar.cpp

Index: xfa/fwl/core/ifwl_scrollbar.cpp
diff --git a/xfa/fwl/core/ifwl_scrollbar.cpp b/xfa/fwl/core/ifwl_scrollbar.cpp
index 8c677f6a0b610376c0b1afc8488d7b2f8ccb3397..e3b9ca64d9995aa9a38ed4c399ad4f4d96e38470 100644
--- a/xfa/fwl/core/ifwl_scrollbar.cpp
+++ b/xfa/fwl/core/ifwl_scrollbar.cpp
@@ -41,7 +41,7 @@ IFWL_ScrollBar::IFWL_ScrollBar(const CFWL_WidgetImpProperties& properties,
       m_bRepaintThumb(FALSE),
       m_fButtonLen(0),
       m_bMinSize(FALSE),
-      m_bCustomLayout(FALSE),
+      m_bCustomLayout(false),
       m_fMinThumb(FWL_SCROLLBAR_MinThumb) {
   m_rtClient.Reset();
   m_rtThumb.Reset();
@@ -53,11 +53,6 @@ IFWL_ScrollBar::IFWL_ScrollBar(const CFWL_WidgetImpProperties& properties,
 
 IFWL_ScrollBar::~IFWL_ScrollBar() {}
 
-FWL_Error IFWL_ScrollBar::GetClassName(CFX_WideString& wsClass) const {
-  wsClass = FWL_CLASS_ScrollBar;
-  return FWL_Error::Succeeded;
-}
-
 FWL_Type IFWL_ScrollBar::GetClassID() const {
   return FWL_Type::ScrollBar;
 }
@@ -70,10 +65,10 @@ FWL_Error IFWL_ScrollBar::Initialize() {
   return FWL_Error::Succeeded;
 }
 
-FWL_Error IFWL_ScrollBar::Finalize() {
+void IFWL_ScrollBar::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
-  return IFWL_Widget::Finalize();
+  IFWL_Widget::Finalize();
 }
 
 FWL_Error IFWL_ScrollBar::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {