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

Source/platform/transforms/IdentityTransformOperation.h

Index: Source/platform/transforms/IdentityTransformOperation.h
diff --git a/Source/platform/transforms/IdentityTransformOperation.h b/Source/platform/transforms/IdentityTransformOperation.h
index 0baa1790d41d3df6dd04e9a492532659c9888c25..b84f2da845b52f3783a57bd3d933d76bf20ac45c 100644
--- a/Source/platform/transforms/IdentityTransformOperation.h
+++ b/Source/platform/transforms/IdentityTransformOperation.h
@@ -42,16 +42,16 @@ public:
     }
 
 private:
-    virtual OperationType type() const override { return Identity; }
+    OperationType type() const override { return Identity; }
 
-    virtual bool operator==(const TransformOperation& o) const override
+    bool operator==(const TransformOperation& o) const override
     {
         return isSameType(o);
     }
 
-    virtual void apply(TransformationMatrix&, const FloatSize&) const override { }
+    void apply(TransformationMatrix&, const FloatSize&) const override { }
 
-    virtual PassRefPtr<TransformOperation> blend(const TransformOperation*, double, bool = false) override
+    PassRefPtr<TransformOperation> blend(const TransformOperation*, double, bool = false) override
     {
         return this;
     }