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

Source/platform/PODArena.h

Index: Source/platform/PODArena.h
diff --git a/Source/platform/PODArena.h b/Source/platform/PODArena.h
index c7498443f00b8833a8e762afde8030b240615294..e70a2f19ee1d28f2ae3ac56f91cef5a12d1a7936 100644
--- a/Source/platform/PODArena.h
+++ b/Source/platform/PODArena.h
@@ -64,8 +64,8 @@ public:
             return adoptRef(new FastMallocAllocator);
         }
 
-        virtual void* allocate(size_t size) override { return fastMalloc(size); }
-        virtual void free(void* ptr) override { fastFree(ptr); }
+        void* allocate(size_t size) override { return fastMalloc(size); }
+        void free(void* ptr) override { fastFree(ptr); }
 
     protected:
         FastMallocAllocator() { }