Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/DocumentMarker.cpp

Index: Source/core/dom/DocumentMarker.cpp
diff --git a/Source/core/dom/DocumentMarker.cpp b/Source/core/dom/DocumentMarker.cpp
index 12b903937f64fbe574d7ac3efac81a132be66a86..5796c8e1b242e97223d9fec9c9832b34908ae4e8 100644
--- a/Source/core/dom/DocumentMarker.cpp
+++ b/Source/core/dom/DocumentMarker.cpp
@@ -37,12 +37,12 @@ DocumentMarkerDetails::~DocumentMarkerDetails()
 {
 }
 
-class DocumentMarkerDescription : public DocumentMarkerDetails {
+class DocumentMarkerDescription FINAL : public DocumentMarkerDetails {
 public:
     static PassRefPtr<DocumentMarkerDescription> create(const String&);
 
     const String& description() const { return m_description; }
-    virtual bool isDescription() const { return true; }
+    virtual bool isDescription() const OVERRIDE { return true; }
 
 private:
     DocumentMarkerDescription(const String& description)
@@ -66,12 +66,12 @@ inline DocumentMarkerDescription* toDocumentMarkerDescription(DocumentMarkerDeta
 }
 
 
-class DocumentMarkerTextMatch : public DocumentMarkerDetails {
+class DocumentMarkerTextMatch FINAL : public DocumentMarkerDetails {
 public:
     static PassRefPtr<DocumentMarkerTextMatch> instanceFor(bool);
 
     bool activeMatch() const { return m_match; }
-    virtual bool isTextMatch() const { return true; }
+    virtual bool isTextMatch() const OVERRIDE { return true; }
 
 private:
     explicit DocumentMarkerTextMatch(bool match)