Detect resursive loading of type3 font char to avoid infinite loop

core/fpdfapi/fpdf_font/cpdf_cidfont.h

Index: core/fpdfapi/fpdf_font/cpdf_cidfont.h
diff --git a/core/fpdfapi/fpdf_font/cpdf_cidfont.h b/core/fpdfapi/fpdf_font/cpdf_cidfont.h
index 2c7df93b648670d318b2e7f7478eb8ff67a01b7b..3e8c042c758798fae52e770985eaa37287f2e43d 100644
--- a/core/fpdfapi/fpdf_font/cpdf_cidfont.h
+++ b/core/fpdfapi/fpdf_font/cpdf_cidfont.h
@@ -41,8 +41,8 @@ class CPDF_CIDFont : public CPDF_Font {
   const CPDF_CIDFont* AsCIDFont() const override;
   CPDF_CIDFont* AsCIDFont() override;
   int GlyphFromCharCode(uint32_t charcode, bool* pVertGlyph) override;
-  int GetCharWidthF(uint32_t charcode, int level = 0) override;
-  FX_RECT GetCharBBox(uint32_t charcode, int level = 0) override;
+  int GetCharWidthF(uint32_t charcode) override;
+  FX_RECT GetCharBBox(uint32_t charcode) override;
   uint32_t GetNextChar(const FX_CHAR* pString,
                        int nStrLen,
                        int& offset) const override;