Update more bindings classes to use OVERRIDE / FINAL when needed

Source/bindings/v8/ScriptHeapSnapshot.cpp

Index: Source/bindings/v8/ScriptHeapSnapshot.cpp
diff --git a/Source/bindings/v8/ScriptHeapSnapshot.cpp b/Source/bindings/v8/ScriptHeapSnapshot.cpp
index 6077b57febde3098507dd54765c3b4b819b4466e..f8ab5dd020f20504e9629bd55e9fd499d7542bab 100644
--- a/Source/bindings/v8/ScriptHeapSnapshot.cpp
+++ b/Source/bindings/v8/ScriptHeapSnapshot.cpp
@@ -63,13 +63,13 @@ SnapshotObjectId ScriptHeapSnapshot::maxSnapshotJSObjectId() const
 
 namespace {
 
-class OutputStreamAdapter : public v8::OutputStream {
+class OutputStreamAdapter FINAL : public v8::OutputStream {
 public:
     OutputStreamAdapter(ScriptHeapSnapshot::OutputStream* output)
         : m_output(output) { }
-    void EndOfStream() { m_output->Close(); }
-    int GetChunkSize() { return 102400; }
-    WriteResult WriteAsciiChunk(char* data, int size)
+    virtual void EndOfStream() OVERRIDE { m_output->Close(); }
+    virtual int GetChunkSize() OVERRIDE { return 102400; }
+    virtual WriteResult WriteAsciiChunk(char* data, int size) OVERRIDE
     {
         m_output->Write(String(data, size));
         return kContinue;