XFA: Fix compilation warnings introduced at b9bc6b7

Inconsisten use of "override".

BUG=pdfium:354
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1577723004 .
diff --git a/xfa/src/fgas/src/layout/fx_rtfbreak.h b/xfa/src/fgas/src/layout/fx_rtfbreak.h
index 2598ad3..6addd52 100644
--- a/xfa/src/fgas/src/layout/fx_rtfbreak.h
+++ b/xfa/src/fgas/src/layout/fx_rtfbreak.h
@@ -66,44 +66,44 @@
  public:

   CFX_RTFBreak(FX_DWORD dwPolicies);

   ~CFX_RTFBreak();

-  virtual void Release() { delete this; }

+  void Release() override { delete this; }

   void SetLineBoundary(FX_FLOAT fLineStart, FX_FLOAT fLineEnd) override final;

   void SetLineStartPos(FX_FLOAT fLinePos) override final;

-  virtual FX_DWORD GetLayoutStyles() const { return m_dwLayoutStyles; }

-  virtual void SetLayoutStyles(FX_DWORD dwLayoutStyles);

-  virtual void SetFont(IFX_Font* pFont);

-  virtual void SetFontSize(FX_FLOAT fFontSize);

-  virtual void SetTabWidth(FX_FLOAT fTabWidth);

-  virtual void AddPositionedTab(FX_FLOAT fTabPos);

-  virtual void SetPositionedTabs(const CFX_FloatArray& tabs);

-  virtual void ClearPositionedTabs();

-  virtual void SetDefaultChar(FX_WCHAR wch);

-  virtual void SetLineBreakChar(FX_WCHAR wch);

-  virtual void SetLineBreakTolerance(FX_FLOAT fTolerance);

-  virtual void SetHorizontalScale(int32_t iScale);

-  virtual void SetVerticalScale(int32_t iScale);

-  virtual void SetCharRotation(int32_t iCharRotation);

-  virtual void SetCharSpace(FX_FLOAT fCharSpace);

-  virtual void SetWordSpace(FX_BOOL bDefault, FX_FLOAT fWordSpace);

-  virtual void SetReadingOrder(FX_BOOL bRTL = FALSE);

-  virtual void SetAlignment(int32_t iAlignment = FX_RTFLINEALIGNMENT_Left);

-  virtual void SetUserData(IFX_Unknown* pUserData);

-  virtual FX_DWORD AppendChar(FX_WCHAR wch);

-  virtual FX_DWORD EndBreak(FX_DWORD dwStatus = FX_RTFBREAK_PieceBreak);

-  virtual int32_t CountBreakPieces() const;

-  virtual const CFX_RTFPiece* GetBreakPiece(int32_t index) const;

-  virtual void GetLineRect(CFX_RectF& rect) const;

-  virtual void ClearBreakPieces();

-  virtual void Reset();

-  virtual int32_t GetDisplayPos(

+  FX_DWORD GetLayoutStyles() const override { return m_dwLayoutStyles; }

+  void SetLayoutStyles(FX_DWORD dwLayoutStyles) override;

+  void SetFont(IFX_Font* pFont) override;

+  void SetFontSize(FX_FLOAT fFontSize) override;

+  void SetTabWidth(FX_FLOAT fTabWidth) override;

+  void AddPositionedTab(FX_FLOAT fTabPos) override;

+  void SetPositionedTabs(const CFX_FloatArray& tabs) override;

+  void ClearPositionedTabs() override;

+  void SetDefaultChar(FX_WCHAR wch) override;

+  void SetLineBreakChar(FX_WCHAR wch) override;

+  void SetLineBreakTolerance(FX_FLOAT fTolerance) override;

+  void SetHorizontalScale(int32_t iScale) override;

+  void SetVerticalScale(int32_t iScale) override;

+  void SetCharRotation(int32_t iCharRotation) override;

+  void SetCharSpace(FX_FLOAT fCharSpace) override;

+  void SetWordSpace(FX_BOOL bDefault, FX_FLOAT fWordSpace) override;

+  void SetReadingOrder(FX_BOOL bRTL = FALSE) override;

+  void SetAlignment(int32_t iAlignment = FX_RTFLINEALIGNMENT_Left) override;

+  void SetUserData(IFX_Unknown* pUserData) override;

+  FX_DWORD AppendChar(FX_WCHAR wch) override;

+  FX_DWORD EndBreak(FX_DWORD dwStatus = FX_RTFBREAK_PieceBreak) override;

+  int32_t CountBreakPieces() const override;

+  const CFX_RTFPiece* GetBreakPiece(int32_t index) const override;

+  void GetLineRect(CFX_RectF& rect) const override;

+  void ClearBreakPieces() override;

+  void Reset() override;

+  int32_t GetDisplayPos(

       FX_LPCRTFTEXTOBJ pText,

       FXTEXT_CHARPOS* pCharPos,

       FX_BOOL bCharCode = FALSE,

       CFX_WideString* pWSForms = NULL,

-      FX_AdjustCharDisplayPos pAdjustPos = NULL) const;

-  virtual int32_t GetCharRects(FX_LPCRTFTEXTOBJ pText,

-                               CFX_RectFArray& rtArray,

-                               FX_BOOL bCharBBox = FALSE) const;

+      FX_AdjustCharDisplayPos pAdjustPos = NULL) const override;

+  int32_t GetCharRects(FX_LPCRTFTEXTOBJ pText,

+                       CFX_RectFArray& rtArray,

+                       FX_BOOL bCharBBox = FALSE) const override;

   FX_DWORD AppendChar_CharCode(FX_WCHAR wch);

   FX_DWORD AppendChar_Combination(CFX_RTFChar* pCurChar, int32_t iRotation);

   FX_DWORD AppendChar_Tab(CFX_RTFChar* pCurChar, int32_t iRotation);