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

Source/platform/Timer.h

Index: Source/platform/Timer.h
diff --git a/Source/platform/Timer.h b/Source/platform/Timer.h
index 1e4bc6ca3e958a37a9b5374ed02bde9ebca5fb35..832b51e082a34e8fd17298949d19c01f66ac093c 100644
--- a/Source/platform/Timer.h
+++ b/Source/platform/Timer.h
@@ -155,13 +155,13 @@ public:
     }
 
 protected:
-    virtual void fired() override
+    void fired() override
     {
         (m_object->*m_function)(this);
     }
 
     NO_LAZY_SWEEP_SANITIZE_ADDRESS
-    virtual bool canFire() const override
+    bool canFire() const override
     {
         // Oilpan: if a timer fires while Oilpan heaps are being lazily
         // swept, it is not safe to proceed if the object is about to