fix Input.Search test case in react15
fix Input.Search test case in react15

zheeeng/ant-design,zheeeng/ant-design,ant-design/ant-design,zheeeng/ant-design,ant-design/ant-design,zheeeng/ant-design,elevensky/ant-design,icaife/ant-design,elevensky/ant-design,elevensky/ant-design,icaife/ant-design,icaife/ant-design,elevensky/ant-design,icaife/ant-design,ant-design/ant-design,ant-design/ant-design