Fixup FX_RECT and FX_SMALL_RECT classes.

core/include/fpdfapi/fpdf_resource.h

Index: core/include/fpdfapi/fpdf_resource.h
diff --git a/core/include/fpdfapi/fpdf_resource.h b/core/include/fpdfapi/fpdf_resource.h
index 7dbc3fd618adc6f3394cb73b0f818b62edb494dd..d48ccfe95b99d1ce0a389313476b90e12ca62e6e 100644
--- a/core/include/fpdfapi/fpdf_resource.h
+++ b/core/include/fpdfapi/fpdf_resource.h
@@ -151,7 +151,7 @@ class CPDF_Font {
   int GetStringWidth(const FX_CHAR* pString, int size);
 
   virtual int GetCharWidthF(FX_DWORD charcode, int level = 0) = 0;
-  virtual void GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level = 0) = 0;
+  virtual FX_RECT GetCharBBox(FX_DWORD charcode, int level = 0) = 0;
 
   CPDF_Document* m_pDocument;
   CFX_Font m_Font;
@@ -228,7 +228,7 @@ class CPDF_SimpleFont : public CPDF_Font {
 
   // CPDF_Font:
   int GetCharWidthF(FX_DWORD charcode, int level = 0) override;
-  void GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level = 0) override;
+  FX_RECT GetCharBBox(FX_DWORD charcode, int level = 0) override;
   int GlyphFromCharCode(FX_DWORD charcode, FX_BOOL* pVertGlyph = NULL) override;
   FX_BOOL IsUnicodeCompatible() const override;
   CFX_WideString UnicodeFromCharCode(FX_DWORD charcode) const override;
@@ -319,7 +319,7 @@ class CPDF_Type3Font : public CPDF_SimpleFont {
   const CPDF_Type3Font* AsType3Font() const override { return this; }
   CPDF_Type3Font* AsType3Font() override { return this; }
   int GetCharWidthF(FX_DWORD charcode, int level = 0) override;
-  void GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level = 0) override;
+  FX_RECT GetCharBBox(FX_DWORD charcode, int level = 0) override;
 
   void SetPageResources(CPDF_Dictionary* pResources) {
     m_pPageResources = pResources;
@@ -369,7 +369,7 @@ class CPDF_CIDFont : public CPDF_Font {
   CPDF_CIDFont* AsCIDFont() override { return this; }
   int GlyphFromCharCode(FX_DWORD charcode, FX_BOOL* pVertGlyph = NULL) override;
   int GetCharWidthF(FX_DWORD charcode, int level = 0) override;
-  void GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level = 0) override;
+  FX_RECT GetCharBBox(FX_DWORD charcode, int level = 0) override;
   FX_DWORD GetNextChar(const FX_CHAR* pString,
                        int nStrLen,
                        int& offset) const override;