Update more platform classes to use OVERRIDE / FINAL when needed

Source/platform/JSONValues.h

Index: Source/platform/JSONValues.h
diff --git a/Source/platform/JSONValues.h b/Source/platform/JSONValues.h
index 0ee8d7dbbcb317d14b87c84c3def6f4cd9d3bf02..8d609c64d3d775a0e3e67e773cf51d5d894784a9 100644
--- a/Source/platform/JSONValues.h
+++ b/Source/platform/JSONValues.h
@@ -110,14 +110,14 @@ public:
         return adoptRef(new JSONBasicValue(value));
     }
 
-    virtual bool asBoolean(bool* output) const;
-    virtual bool asNumber(double* output) const;
-    virtual bool asNumber(long* output) const;
-    virtual bool asNumber(int* output) const;
-    virtual bool asNumber(unsigned long* output) const;
-    virtual bool asNumber(unsigned* output) const;
+    virtual bool asBoolean(bool* output) const OVERRIDE;
+    virtual bool asNumber(double* output) const OVERRIDE;
+    virtual bool asNumber(long* output) const OVERRIDE;
+    virtual bool asNumber(int* output) const OVERRIDE;
+    virtual bool asNumber(unsigned long* output) const OVERRIDE;
+    virtual bool asNumber(unsigned* output) const OVERRIDE;
 
-    virtual void writeJSON(StringBuilder* output) const;
+    virtual void writeJSON(StringBuilder* output) const OVERRIDE;
 
 private:
     explicit JSONBasicValue(bool value) : JSONValue(TypeBoolean), m_boolValue(value) { }
@@ -142,9 +142,9 @@ public:
         return adoptRef(new JSONString(value));
     }
 
-    virtual bool asString(String* output) const;
+    virtual bool asString(String* output) const OVERRIDE;
 
-    virtual void writeJSON(StringBuilder* output) const;
+    virtual void writeJSON(StringBuilder* output) const OVERRIDE;
 
 private:
     explicit JSONString(const String& value) : JSONValue(TypeString), m_stringValue(value) { }
@@ -161,13 +161,13 @@ public:
     typedef Dictionary::iterator iterator;
     typedef Dictionary::const_iterator const_iterator;
 
-    virtual PassRefPtr<JSONObject> asObject();
+    virtual PassRefPtr<JSONObject> asObject() OVERRIDE;
     JSONObject* openAccessors();
 
 protected:
-    ~JSONObjectBase();
+    virtual ~JSONObjectBase();
 
-    virtual bool asObject(RefPtr<JSONObject>* output);
+    virtual bool asObject(RefPtr<JSONObject>* output) OVERRIDE;
 
     void setBoolean(const String& name, bool);
     void setNumber(const String& name, double);
@@ -193,7 +193,7 @@ protected:
 
     void remove(const String& name);
 
-    virtual void writeJSON(StringBuilder* output) const;
+    virtual void writeJSON(StringBuilder* output) const OVERRIDE;
 
     iterator begin() { return m_data.begin(); }
     iterator end() { return m_data.end(); }
@@ -248,14 +248,14 @@ public:
     typedef Vector<RefPtr<JSONValue> >::iterator iterator;
     typedef Vector<RefPtr<JSONValue> >::const_iterator const_iterator;
 
-    virtual PassRefPtr<JSONArray> asArray();
+    virtual PassRefPtr<JSONArray> asArray() OVERRIDE;
 
     unsigned length() const { return m_data.size(); }
 
 protected:
-    ~JSONArrayBase();
+    virtual ~JSONArrayBase();
 
-    virtual bool asArray(RefPtr<JSONArray>* output);
+    virtual bool asArray(RefPtr<JSONArray>* output) OVERRIDE;
 
     void pushBoolean(bool);
     void pushInt(int);
@@ -267,7 +267,7 @@ protected:
 
     PassRefPtr<JSONValue> get(size_t index);
 
-    virtual void writeJSON(StringBuilder* output) const;
+    virtual void writeJSON(StringBuilder* output) const OVERRIDE;
 
     iterator begin() { return m_data.begin(); }
     iterator end() { return m_data.end(); }