**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
I've started recieving this warning about my SVGs which is using [feGaussianBlur](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/feGaussianBlur): 
`Warning: Expected server HTML to contain a matching <feGaussianBlur> in <filter>.`

**What is the expected behavior?**
Should be no warnings because there are no difference.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Such behavior started right after updating to `React 16.0.0-rc.3` and never happened with `React 15.6.1`
if (
    !foundDevTools &&
    ExecutionEnvironment.canUseDOM &&
    window.top === window.self
  ) {
    
    if (
      (navigator.userAgent.indexOf('Chrome') > -1 &&
        navigator.userAgent.indexOf('Edge') === -1) ||
      navigator.userAgent.indexOf('Firefox') > -1
    ) {
      const protocol = window.location.protocol;
      
      if (/^(https?|file):$/.test(protocol)) {
        console.info(
          '%cDownload the React DevTools ' +
            'for a better development experience: ' +
            'https://fb.me/react-devtools' +
            (protocol === 'file:'
              ? '\nYou might need to use a local HTTP server (instead of file://): ' +
                  'https://fb.me/react-devtools-faq'
              : ''),
          'font-weight:bold',
        );
      }
    }
  }
}
module.exports = ReactDOMFiber;