Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/audio/AudioDSPKernelProcessor.h

Index: Source/platform/audio/AudioDSPKernelProcessor.h
diff --git a/Source/platform/audio/AudioDSPKernelProcessor.h b/Source/platform/audio/AudioDSPKernelProcessor.h
index ebbb55f7ad33d9f8690092ad032acc85b0edc632..23af51ccf6ea8ba4c0d4a44c095ff51327e02aea 100644
--- a/Source/platform/audio/AudioDSPKernelProcessor.h
+++ b/Source/platform/audio/AudioDSPKernelProcessor.h
@@ -58,12 +58,12 @@ public:
     virtual PassOwnPtr<AudioDSPKernel> createKernel() = 0;
 
     // AudioProcessor methods
-    virtual void initialize();
-    virtual void uninitialize();
-    virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess);
-    virtual void reset();
-    virtual void setNumberOfChannels(unsigned numberOfChannels);
-    virtual unsigned numberOfChannels() const { return m_numberOfChannels; }
+    virtual void initialize() OVERRIDE;
+    virtual void uninitialize() OVERRIDE;
+    virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) OVERRIDE;
+    virtual void reset() OVERRIDE;
+    virtual void setNumberOfChannels(unsigned) OVERRIDE;
+    virtual unsigned numberOfChannels() const OVERRIDE { return m_numberOfChannels; }
 
     virtual double tailTime() const OVERRIDE;
     virtual double latencyTime() const OVERRIDE;