Update WTF classes to use OVERRIDE / FINAL when needed

Source/wtf/FilePrintStream.h

Index: Source/wtf/FilePrintStream.h
diff --git a/Source/wtf/FilePrintStream.h b/Source/wtf/FilePrintStream.h
index eae458af42dce5c44ea37a17862cd8657b74795b..abb26dc3f2d5864fff9f71fb116c7dacb81c635c 100644
--- a/Source/wtf/FilePrintStream.h
+++ b/Source/wtf/FilePrintStream.h
@@ -32,7 +32,7 @@
 
 namespace WTF {
 
-class FilePrintStream : public PrintStream {
+class FilePrintStream FINAL : public PrintStream {
 public:
     enum AdoptionMode {
         Adopt,
@@ -46,8 +46,8 @@ public:
 
     FILE* file() { return m_file; }
 
-    void vprintf(const char* format, va_list) WTF_ATTRIBUTE_PRINTF(2, 0);
-    void flush();
+    virtual void vprintf(const char* format, va_list) WTF_ATTRIBUTE_PRINTF(2, 0) OVERRIDE;
+    virtual void flush() OVERRIDE;
 
 private:
     FILE* m_file;