Fix virtual/override/final usage in Source/bindings/.

Source/bindings/core/v8/ScriptHeapSnapshot.cpp

 /*
  * Copyright (c) 2010, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 {
     const_cast<v8::HeapSnapshot*>(m_snapshot)->Delete();
 }
 
 namespace {
 
 class OutputStreamAdapter final : public v8::OutputStream {
 public:
     OutputStreamAdapter(ScriptHeapSnapshot::OutputStream* output)
         : m_output(output) { }
-    virtual void EndOfStream() override { m_output->Close(); }
-    virtual int GetChunkSize() override { return 102400; }
-    virtual WriteResult WriteAsciiChunk(char* data, int size) override
+    void EndOfStream() override { m_output->Close(); }
+    int GetChunkSize() override { return 102400; }
+    WriteResult WriteAsciiChunk(char* data, int size) override
     {
         m_output->Write(String(data, size));
         return kContinue;
     }
 private:
     ScriptHeapSnapshot::OutputStream* m_output;
 };
 
 } // namespace
 
 void ScriptHeapSnapshot::writeJSON(ScriptHeapSnapshot::OutputStream* stream)
 {
     OutputStreamAdapter outputStream(stream);
     m_snapshot->Serialize(&outputStream, v8::HeapSnapshot::kJSON);
 }
 
 } // namespace blink