Use override in more classes in core/

core/include/fpdfapi/fpdf_pageobj.h

Index: core/include/fpdfapi/fpdf_pageobj.h
diff --git a/core/include/fpdfapi/fpdf_pageobj.h b/core/include/fpdfapi/fpdf_pageobj.h
index be81244ef4df5cad7c62c395def72a8e29ced0d0..47c46969ae3219c91529b8587d57cce612bea357 100644
--- a/core/include/fpdfapi/fpdf_pageobj.h
+++ b/core/include/fpdfapi/fpdf_pageobj.h
@@ -70,9 +70,7 @@ class CPDF_Path : public CFX_CountRef<CFX_PathData> {
 class CPDF_ClipPathData {
  public:
   CPDF_ClipPathData();
-
   CPDF_ClipPathData(const CPDF_ClipPathData&);
-
   ~CPDF_ClipPathData();
 
   void SetCount(int path_count, int text_count);
@@ -88,6 +86,7 @@ class CPDF_ClipPathData {
 
   CPDF_TextObject** m_pTextList;
 };
+
 class CPDF_ClipPath : public CFX_CountRef<CPDF_ClipPathData> {
  public:
   FX_DWORD GetPathCount() const { return m_pObject->m_PathCount; }
@@ -492,8 +491,8 @@ class CPDF_TextObject : public CPDF_PageObject {
 class CPDF_PathObject : public CPDF_PageObject {
  public:
   CPDF_PathObject() { m_Type = PDFPAGE_PATH; }

[Tom Sepez, 2015/08/14 20:15:52]

nit: Bleh.  constructor setting superclass members? CPDF_PageObject() ctor
should take a type? For followup.

[Lei Zhang, 2015/08/14 21:09:26]

Ya, I'll do a follow up.

+  ~CPDF_PathObject() override {}
 
-  virtual ~CPDF_PathObject() {}
   void Transform(const CFX_AffineMatrix& maxtrix) override;
 
   void SetGraphState(CPDF_GraphState GraphState);
@@ -515,8 +514,8 @@ class CPDF_PathObject : public CPDF_PageObject {
 class CPDF_ImageObject : public CPDF_PageObject {
  public:
   CPDF_ImageObject();
+  ~CPDF_ImageObject() override;
 
-  virtual ~CPDF_ImageObject();
   void Transform(const CFX_AffineMatrix& matrix) override;
 
   CPDF_Image* m_pImage;
@@ -532,8 +531,7 @@ class CPDF_ImageObject : public CPDF_PageObject {
 class CPDF_ShadingObject : public CPDF_PageObject {
  public:
   CPDF_ShadingObject();
-
-  virtual ~CPDF_ShadingObject();
+  ~CPDF_ShadingObject() override;
 
   CPDF_ShadingPattern* m_pShading;
 
@@ -553,8 +551,8 @@ class CPDF_FormObject : public CPDF_PageObject {
     m_Type = PDFPAGE_FORM;
     m_pForm = NULL;
   }
+  ~CPDF_FormObject() override;
 
-  virtual ~CPDF_FormObject();
   void Transform(const CFX_AffineMatrix& matrix) override;
 
   CPDF_Form* m_pForm;