Add more overrides.

core/src/fpdfapi/fpdf_font/ttgsubtable.h

Index: core/src/fpdfapi/fpdf_font/ttgsubtable.h
diff --git a/core/src/fpdfapi/fpdf_font/ttgsubtable.h b/core/src/fpdfapi/fpdf_font/ttgsubtable.h
index 7dd8cce36ca4e31523ed6f8165f516afbf8ab789..e3c996565460789a204d6844e03785a0f8c03fdf 100644
--- a/core/src/fpdfapi/fpdf_font/ttgsubtable.h
+++ b/core/src/fpdfapi/fpdf_font/ttgsubtable.h
@@ -260,7 +260,7 @@ class CFX_CTTGSUBTable {
     TSingleSubstFormat2() : Coverage(NULL), GlyphCount(0), Substitute(NULL) {
       SubstFormat = 2;
     }
-    ~TSingleSubstFormat2() {
+    ~TSingleSubstFormat2() override {
       delete Coverage;
       delete[] Substitute;
     }
@@ -356,8 +356,7 @@ class CFX_CTTGSUBTable {
 class CFX_GSUBTable final : public IFX_GSUBTable {
  public:
   ~CFX_GSUBTable() override {}
-  virtual FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum,
-                                   FX_DWORD* vglyphnum) override;
+  FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum, FX_DWORD* vglyphnum) override;
 
   CFX_CTTGSUBTable m_GsubImp;
 };