Remove unused TransformOperation::isIdentity

Source/platform/transforms/ScaleTransformOperation.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 30 matching lines @@
         return adoptRef(new ScaleTransformOperation(sx, sy, sz, type));
     }
 
     double x() const { return m_x; }
     double y() const { return m_y; }
     double z() const { return m_z; }
 
     virtual bool canBlendWith(const TransformOperation& other) const;
 
 private:
-    virtual bool isIdentity() const OVERRIDE { return m_x == 1 &&  m_y == 1 &&  m_z == 1; }
-
     virtual OperationType type() const OVERRIDE { return m_type; }
 
     virtual bool operator==(const TransformOperation& o) const OVERRIDE
     {
         if (!isSameType(o))
             return false;
         const ScaleTransformOperation* s = static_cast<const ScaleTransformOperation*>(&o);
         return m_x == s->m_x && m_y == s->m_y && m_z == s->m_z;
     }
 
@@ skipping 15 matching lines @@
 
     double m_x;
     double m_y;
     double m_z;
     OperationType m_type;
 };
 
 } // namespace blink
 
 #endif // ScaleTransformOperation_h