Cleanup unneeded FWL theme code.

xfa/fxfa/app/xfa_fwltheme.h

Index: xfa/fxfa/app/xfa_fwltheme.h
diff --git a/xfa/fxfa/app/xfa_fwltheme.h b/xfa/fxfa/app/xfa_fwltheme.h
index 77659236ee17abf4146e9bdfa035a55a80a68097..8c045de79195a0da4a6251742038ed8e0a086dae 100644
--- a/xfa/fxfa/app/xfa_fwltheme.h
+++ b/xfa/fxfa/app/xfa_fwltheme.h
@@ -29,34 +29,17 @@ class CXFA_FWLTheme final : public IFWL_ThemeProvider {
   CXFA_FWLTheme(CXFA_FFApp* pApp);
   ~CXFA_FWLTheme() override;
 
+  FWL_Error Initialize();
+  FWL_Error Finalize();
+
   // IFWL_ThemeProvider:
-  bool IsValidWidget(IFWL_Widget* pWidget) override;
-  uint32_t GetThemeID(IFWL_Widget* pWidget) override;
-  uint32_t SetThemeID(IFWL_Widget* pWidget,
-                      uint32_t dwThemeID,
-                      FX_BOOL bChildren = TRUE) override;
-  FWL_Error GetThemeMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) override;
-  FWL_Error SetThemeMatrix(IFWL_Widget* pWidget,
-                           const CFX_Matrix& matrix) override;
   FX_BOOL DrawBackground(CFWL_ThemeBackground* pParams) override;
   FX_BOOL DrawText(CFWL_ThemeText* pParams) override;
   void* GetCapacity(CFWL_ThemePart* pThemePart,
                     CFWL_WidgetCapacity dwCapacity) override;
   FX_BOOL IsCustomizedLayout(IFWL_Widget* pWidget) override;
-  FWL_Error GetPartRect(CFWL_ThemePart* pThemePart, CFX_RectF& rtPart) override;
-  FX_BOOL IsInPart(CFWL_ThemePart* pThemePart,
-                   FX_FLOAT fx,
-                   FX_FLOAT fy) override;
   FX_BOOL CalcTextRect(CFWL_ThemeText* pParams, CFX_RectF& rect) override;
 
-  FWL_Error GetClassName(CFX_WideString& wsClass) const {
-    return FWL_Error::Succeeded;
-  }
-  uint32_t GetHashCode() const { return 0; }
-  FWL_Error Initialize();
-  FWL_Error Finalize();
-  FWL_Error GetPartRect(CFWL_ThemePart* pThemePart);
-
  protected:
   CFWL_WidgetTP* GetTheme(IFWL_Widget* pWidget);
   std::unique_ptr<CFWL_CheckBoxTP> m_pCheckBoxTP;