Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/ProcessingInstruction.h

Index: Source/core/dom/ProcessingInstruction.h
diff --git a/Source/core/dom/ProcessingInstruction.h b/Source/core/dom/ProcessingInstruction.h
index d495103c8c0c3d6688b7d7773660edb53c1858a1..374534f75d8a277f2a87cba2b19fc6284b880757 100644
--- a/Source/core/dom/ProcessingInstruction.h
+++ b/Source/core/dom/ProcessingInstruction.h
@@ -54,18 +54,18 @@ private:
     friend class CharacterData;
     ProcessingInstruction(Document&, const String& target, const String& data);
 
-    virtual String nodeName() const;
-    virtual NodeType nodeType() const;
-    virtual PassRefPtr<Node> cloneNode(bool deep = true);
+    virtual String nodeName() const OVERRIDE;
+    virtual NodeType nodeType() const OVERRIDE;
+    virtual PassRefPtr<Node> cloneNode(bool deep = true) OVERRIDE;
 
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
 
     void checkStyleSheet();
-    virtual void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource*);
-    virtual void setXSLStyleSheet(const String& href, const KURL& baseURL, const String& sheet);
+    virtual void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource*) OVERRIDE;
+    virtual void setXSLStyleSheet(const String& href, const KURL& baseURL, const String& sheet) OVERRIDE;
 
-    virtual bool sheetLoaded();
+    virtual bool sheetLoaded() OVERRIDE;
 
     void parseStyleSheet(const String& sheet);