Make CPDF_Font::Create() return a std::unique_ptr.

core/fpdfapi/fpdf_font/font_int.h

Index: core/fpdfapi/fpdf_font/font_int.h
diff --git a/core/fpdfapi/fpdf_font/font_int.h b/core/fpdfapi/fpdf_font/font_int.h
index 512fb6c47495284b7b75860efaa1ee87e9b976a4..bcadc8d8266393611bc07534d747c6ec7408b5dc 100644
--- a/core/fpdfapi/fpdf_font/font_int.h
+++ b/core/fpdfapi/fpdf_font/font_int.h
@@ -46,8 +46,8 @@ class CFX_StockFontArray {
   CFX_StockFontArray();
   ~CFX_StockFontArray();
 
-  // Takes ownership of |pFont|.
-  void SetFont(uint32_t index, CPDF_Font* pFont);
+  // Takes ownership of |pFont|, returns unowned pointer to it.
+  CPDF_Font* SetFont(uint32_t index, std::unique_ptr<CPDF_Font> pFont);
   CPDF_Font* GetFont(uint32_t index) const;
 
  private:
@@ -62,8 +62,10 @@ class CPDF_FontGlobals {
   void Clear(CPDF_Document* pDoc);
   CPDF_Font* Find(CPDF_Document* pDoc, uint32_t index);
 
-  // Takes ownership of |pFont|.
-  void Set(CPDF_Document* key, uint32_t index, CPDF_Font* pFont);
+  // Takes ownership of |pFont|, returns unowned pointer to it.
+  CPDF_Font* Set(CPDF_Document* key,
+                 uint32_t index,
+                 std::unique_ptr<CPDF_Font> pFont);
 
   CPDF_CMapManager m_CMapManager;
   struct {