Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/transforms/RotateTransformOperation.h

Index: Source/platform/transforms/RotateTransformOperation.h
diff --git a/Source/platform/transforms/RotateTransformOperation.h b/Source/platform/transforms/RotateTransformOperation.h
index 2894b84d689255832f3a4a1ea280e06e64b0abb8..637697d2eeecf419ae5b63300cca1a43d7724408 100644
--- a/Source/platform/transforms/RotateTransformOperation.h
+++ b/Source/platform/transforms/RotateTransformOperation.h
@@ -47,7 +47,7 @@ public:
     double angle() const { return m_angle; }
 
 private:
-    virtual bool isIdentity() const { return m_angle == 0; }
+    virtual bool isIdentity() const OVERRIDE { return !m_angle; }
 
     virtual OperationType type() const OVERRIDE { return m_type; }
 
@@ -59,12 +59,12 @@ private:
         return m_x == r->m_x && m_y == r->m_y && m_z == r->m_z && m_angle == r->m_angle;
     }
 
-    virtual void apply(TransformationMatrix& transform, const FloatSize& /*borderBoxSize*/) const
+    virtual void apply(TransformationMatrix& transform, const FloatSize& /*borderBoxSize*/) const OVERRIDE
     {
         transform.rotate3d(m_x, m_y, m_z, m_angle);
     }
 
-    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;
 
     RotateTransformOperation(double x, double y, double z, double angle, OperationType type)
         : m_x(x)