Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/webaudio/OfflineAudioDestinationNode.h

Index: Source/modules/webaudio/OfflineAudioDestinationNode.h
diff --git a/Source/modules/webaudio/OfflineAudioDestinationNode.h b/Source/modules/webaudio/OfflineAudioDestinationNode.h
index a2f2a6154170123e81986791530e0560a8fe9c97..5965cdabf85902bd8483115c3a5fe0f248e118f6 100644
--- a/Source/modules/webaudio/OfflineAudioDestinationNode.h
+++ b/Source/modules/webaudio/OfflineAudioDestinationNode.h
@@ -36,7 +36,7 @@ namespace WebCore {
 class AudioBus;
 class AudioContext;
 
-class OfflineAudioDestinationNode : public AudioDestinationNode {
+class OfflineAudioDestinationNode FINAL : public AudioDestinationNode {
 public:
     static PassRefPtr<OfflineAudioDestinationNode> create(AudioContext* context, AudioBuffer* renderTarget)
     {
@@ -53,7 +53,7 @@ public:
     virtual void enableInput(const String&) OVERRIDE { }
     virtual void startRendering() OVERRIDE;
 
-    virtual float sampleRate()  const { return m_renderTarget->sampleRate(); }
+    virtual float sampleRate()  const OVERRIDE { return m_renderTarget->sampleRate(); }
 
 private:
     class OfflineRenderingTask;