Update more platform classes to use OVERRIDE / FINAL when needed

Source/platform/audio/SincResampler.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 128 matching lines @@
     // FIXME: Find a way to make the following const-correct:
     bus->setChannelMemory(0, buffer, numberOfSourceFrames);
 
     m_sourceProvider->provideInput(bus.get(), numberOfSourceFrames);
 }
 
 namespace {
 
 // BufferSourceProvider is an AudioSourceProvider wrapping an in-memory buffer.
 
-class BufferSourceProvider : public AudioSourceProvider {
+class BufferSourceProvider FINAL : public AudioSourceProvider {
 public:
     BufferSourceProvider(const float* source, size_t numberOfSourceFrames)
         : m_source(source)
         , m_sourceFramesAvailable(numberOfSourceFrames)
     {
     }
 
     // Consumes samples from the in-memory buffer.
-    virtual void provideInput(AudioBus* bus, size_t framesToProcess)
+    virtual void provideInput(AudioBus* bus, size_t framesToProcess) OVERRIDE
     {
         ASSERT(m_source && bus);
         if (!m_source || !bus)
             return;
 
         float* buffer = bus->channel(0)->mutableData();
 
         // Clamp to number of frames available and zero-pad.
         size_t framesToCopy = min(m_sourceFramesAvailable, framesToProcess);
         memcpy(buffer, m_source, sizeof(float) * framesToCopy);
@@ skipping 296 matching lines @@
 
         // Step (4)
         // Refresh the buffer with more input.
         consumeSource(r5, m_blockSize);
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)