Cleanup unused methods and return values in FWL code.

xfa/fwl/theme/cfwl_pushbuttontp.cpp

Index: xfa/fwl/theme/cfwl_pushbuttontp.cpp
diff --git a/xfa/fwl/theme/cfwl_pushbuttontp.cpp b/xfa/fwl/theme/cfwl_pushbuttontp.cpp
index 62b8ffef6568dad8c7586cb997b53b2d66d3d818..20446da54b5da71b8a86d627c8d779918bf22659 100644
--- a/xfa/fwl/theme/cfwl_pushbuttontp.cpp
+++ b/xfa/fwl/theme/cfwl_pushbuttontp.cpp
@@ -29,7 +29,8 @@ uint32_t CFWL_PushButtonTP::SetThemeID(IFWL_Widget* pWidget,
   SetThemeData(FWL_GetThemeColor(dwThemeID));
   return CFWL_WidgetTP::SetThemeID(pWidget, dwThemeID);
 }
-FX_BOOL CFWL_PushButtonTP::DrawBackground(CFWL_ThemeBackground* pParams) {
+
+void CFWL_PushButtonTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   switch (pParams->m_iPart) {
     case CFWL_Part::Border: {
       DrawBorder(pParams->m_pGraphics, &pParams->m_rtPart, &pParams->m_matrix);
@@ -87,10 +88,11 @@ FX_BOOL CFWL_PushButtonTP::DrawBackground(CFWL_ThemeBackground* pParams) {
       pGraphics->RestoreGraphState();
       break;
     }
-    default: {}
+    default:
+      break;
   }
-  return TRUE;
 }
+
 void* CFWL_PushButtonTP::GetCapacity(CFWL_ThemePart* pThemePart,
                                      CFWL_WidgetCapacity dwCapacity) {
   if (dwCapacity == CFWL_WidgetCapacity::Margin) {
@@ -99,14 +101,17 @@ void* CFWL_PushButtonTP::GetCapacity(CFWL_ThemePart* pThemePart,
   }
   return CFWL_WidgetTP::GetCapacity(pThemePart, dwCapacity);
 }
-FWL_Error CFWL_PushButtonTP::Initialize() {
+
+void CFWL_PushButtonTP::Initialize() {
   InitTTO();
-  return CFWL_WidgetTP::Initialize();
+  CFWL_WidgetTP::Initialize();
 }
-FWL_Error CFWL_PushButtonTP::Finalize() {
+
+void CFWL_PushButtonTP::Finalize() {
   FinalizeTTO();
-  return CFWL_WidgetTP::Finalize();
+  CFWL_WidgetTP::Finalize();
 }
+
 void CFWL_PushButtonTP::SetThemeData(uint32_t dwID) {
   if (dwID) {
     m_pThemeData->clrBorder[0] = ArgbEncode(255, 55, 98, 6);
@@ -152,6 +157,7 @@ void CFWL_PushButtonTP::SetThemeData(uint32_t dwID) {
     m_pThemeData->clrFill[4] = ArgbEncode(255, 245, 244, 234);
   }
 }
+
 int32_t CFWL_PushButtonTP::GetColorID(uint32_t dwStates) const {
   int32_t color = 0;
   if (dwStates & CFWL_PartState_Disabled)