Fix virtual/override/final usage in Source/core/{animation,css,style}/.

Source/core/style/PathStyleMotionPath.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PathStyleMotionPath_h
 #define PathStyleMotionPath_h
 
 #include "core/style/StyleMotionPath.h"
 
 #include "platform/graphics/Path.h"
 #include "wtf/Assertions.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class PathStyleMotionPath : public StyleMotionPath {
 public:
     static PassRefPtr<PathStyleMotionPath> create(const String& pathString)
     {
         return adoptRef(new PathStyleMotionPath(pathString));
     }
 
-    virtual bool isPathStyleMotionPath() const override { return true; }
+    bool isPathStyleMotionPath() const override { return true; }
 
     bool equals(const PathStyleMotionPath& other) const
     {
         return m_pathString == other.m_pathString;
     }
 
     const Path& path() const { return m_path; }
 
     const String& pathString() const { return m_pathString; }
 
     bool isClosed() const;
 
     float length() const { return m_length; }
 
 private:
     PathStyleMotionPath(const String& pathString);
 
     String m_pathString;
     Path m_path;
     float m_length;
 };
 
 DEFINE_TYPE_CASTS(PathStyleMotionPath, StyleMotionPath, value, value->isPathStyleMotionPath(), value.isPathStyleMotionPath());
 
 } // namespace blink
 
 #endif // PathStyleMotionPath_h