Remove FWL globals.

xfa/fwl/core/cfwl_combobox.h

Index: xfa/fwl/core/cfwl_combobox.h
diff --git a/xfa/fwl/core/cfwl_combobox.h b/xfa/fwl/core/cfwl_combobox.h
index 6e4988fe8e54b150a3857657b2221b3207f2aa09..bb19e55653283505ebe79d1f0ba197e768cf93b2 100644
--- a/xfa/fwl/core/cfwl_combobox.h
+++ b/xfa/fwl/core/cfwl_combobox.h
@@ -20,13 +20,14 @@ class CFWL_ComboBoxItem;
 
 class CFWL_ComboBox : public CFWL_Widget {
  public:
-  CFWL_ComboBox();
+  CFWL_ComboBox(const IFWL_App*);
   ~CFWL_ComboBox() override;
 
   IFWL_ComboBox* GetWidget() override;
   const IFWL_ComboBox* GetWidget() const override;
 
-  FWL_Error Initialize(const CFWL_WidgetProperties* pProperties = nullptr);
+  void Initialize(const CFWL_WidgetProperties* pProperties);
+
   int32_t AddString(const CFX_WideStringC& wsText);
   int32_t AddString(const CFX_WideStringC& wsText, CFX_DIBitmap* pIcon);
   bool RemoveAt(int32_t iIndex);  // Returns false iff |iIndex| out of range.