Make CFX_Color constructor explicit

xfa/fxgraphics/cfx_color.h

Index: xfa/fxgraphics/cfx_color.h
diff --git a/xfa/fxgraphics/cfx_color.h b/xfa/fxgraphics/cfx_color.h
index bf61c6859a018ca1f4e46ebcfbc9e204886e85fe..0f321764f92be6bc636afe14fc6710c7a1b24149 100644
--- a/xfa/fxgraphics/cfx_color.h
+++ b/xfa/fxgraphics/cfx_color.h
@@ -18,15 +18,13 @@ enum { FX_COLOR_None = 0, FX_COLOR_Solid, FX_COLOR_Pattern, FX_COLOR_Shading };
 class CFX_Color {
  public:
   CFX_Color();
-  // TODO(weili): Remove implicit conversions. Make this explicit.
-  CFX_Color(const FX_ARGB argb);
-
-  explicit CFX_Color(CFX_Pattern* pattern, const FX_ARGB argb = 0x0);
+  explicit CFX_Color(const FX_ARGB argb);
   explicit CFX_Color(CFX_Shading* shading);
+  CFX_Color(CFX_Pattern* pattern, const FX_ARGB argb);
   virtual ~CFX_Color();
 
   FWL_Error Set(const FX_ARGB argb);
-  FWL_Error Set(CFX_Pattern* pattern, const FX_ARGB argb = 0x0);
+  FWL_Error Set(CFX_Pattern* pattern, const FX_ARGB argb);
   FWL_Error Set(CFX_Shading* shading);
 
  private: