Update accessibility classes to use OVERRIDE / FINAL when needed

Source/core/accessibility/AXMediaControls.h

Index: Source/core/accessibility/AXMediaControls.h
diff --git a/Source/core/accessibility/AXMediaControls.h b/Source/core/accessibility/AXMediaControls.h
index cbf6a2f5662fd38bfda7b3d994080083d8a8c0ad..0bc858269a29865710cb8867bf4b151cacad70b7 100644
--- a/Source/core/accessibility/AXMediaControls.h
+++ b/Source/core/accessibility/AXMediaControls.h
@@ -43,19 +43,19 @@ public:
 
     virtual AccessibilityRole roleValue() const OVERRIDE;
 
-    virtual String title() const OVERRIDE;
+    virtual String title() const OVERRIDE FINAL;
     virtual String accessibilityDescription() const OVERRIDE;
     virtual String helpText() const OVERRIDE;
 
 protected:
     explicit AccessibilityMediaControl(RenderObject*);
     MediaControlElementType controlType() const;
-    virtual void accessibilityText(Vector<AccessibilityText>&) OVERRIDE;
+    virtual void accessibilityText(Vector<AccessibilityText>&) OVERRIDE FINAL;
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 };
 
 
-class AccessibilityMediaTimeline : public AXSlider {
+class AccessibilityMediaTimeline FINAL : public AXSlider {
 
 public:
     static PassRefPtr<AXObject> create(RenderObject*);
@@ -70,7 +70,7 @@ private:
 };
 
 
-class AXMediaControlsContainer : public AccessibilityMediaControl {
+class AXMediaControlsContainer FINAL : public AccessibilityMediaControl {
 
 public:
     static PassRefPtr<AXObject> create(RenderObject*);
@@ -88,7 +88,7 @@ private:
 };
 
 
-class AccessibilityMediaTimeDisplay : public AccessibilityMediaControl {
+class AccessibilityMediaTimeDisplay FINAL : public AccessibilityMediaControl {
 
 public:
     static PassRefPtr<AXObject> create(RenderObject*);