Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/transforms/ScaleTransformOperation.h

Index: Source/platform/transforms/ScaleTransformOperation.h
diff --git a/Source/platform/transforms/ScaleTransformOperation.h b/Source/platform/transforms/ScaleTransformOperation.h
index bcc93eeffb8add85e890499133a157a53e01471f..46dbe2c819d61149077802d2dee81680926438e9 100644
--- a/Source/platform/transforms/ScaleTransformOperation.h
+++ b/Source/platform/transforms/ScaleTransformOperation.h
@@ -46,7 +46,7 @@ public:
     double z() const { return m_z; }
 
 private:
-    virtual bool isIdentity() const { return m_x == 1 &&  m_y == 1 &&  m_z == 1; }
+    virtual bool isIdentity() const OVERRIDE { return m_x == 1 &&  m_y == 1 &&  m_z == 1; }
 
     virtual OperationType type() const OVERRIDE { return m_type; }
 
@@ -58,12 +58,12 @@ private:
         return m_x == s->m_x && m_y == s->m_y && m_z == s->m_z;
     }
 
-    virtual void apply(TransformationMatrix& transform, const FloatSize&) const
+    virtual void apply(TransformationMatrix& transform, const FloatSize&) const OVERRIDE
     {
         transform.scale3d(m_x, m_y, m_z);
     }
 
-    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;
 
     ScaleTransformOperation(double sx, double sy, double sz, OperationType type)
         : m_x(sx)