Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/transforms/MatrixTransformOperation.h

Index: Source/platform/transforms/MatrixTransformOperation.h
diff --git a/Source/platform/transforms/MatrixTransformOperation.h b/Source/platform/transforms/MatrixTransformOperation.h
index 139006f698dedc6320ccfb976af0b4ddc103330b..cd256a5053a753331bb29ec9e29c00d1545714c4 100644
--- a/Source/platform/transforms/MatrixTransformOperation.h
+++ b/Source/platform/transforms/MatrixTransformOperation.h
@@ -45,7 +45,7 @@ public:
     TransformationMatrix matrix() const { return TransformationMatrix(m_a, m_b, m_c, m_d, m_e, m_f); }
 
 private:
-    virtual bool isIdentity() const { return m_a == 1 && m_b == 0 && m_c == 0 && m_d == 1 && m_e == 0 && m_f == 0; }
+    virtual bool isIdentity() const OVERRIDE { return m_a == 1 && !m_b && !m_c && m_d == 1 && !m_e && !m_f; }
 
     virtual OperationType type() const OVERRIDE { return Matrix; }
 
@@ -58,13 +58,13 @@ private:
         return m_a == m->m_a && m_b == m->m_b && m_c == m->m_c && m_d == m->m_d && m_e == m->m_e && m_f == m->m_f;
     }
 
-    virtual void apply(TransformationMatrix& transform, const FloatSize&) const
+    virtual void apply(TransformationMatrix& transform, const FloatSize&) const OVERRIDE
     {
         TransformationMatrix matrix(m_a, m_b, m_c, m_d, m_e, m_f);
         transform.multiply(matrix);
     }
 
-    virtual PassRefPtr<TransformOperation> blend(const TransformOperation* from, double progress, bool blendToIdentity = false);
+    virtual PassRefPtr<TransformOperation> blend(const TransformOperation* from, double progress, bool blendToIdentity = false) OVERRIDE;
 
     MatrixTransformOperation(double a, double b, double c, double d, double e, double f)
         : m_a(a)