**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`
(container.parentNode: any).removeChild(child);
    } else {
      container.removeChild(child);
    }
  },
  now: ReactDOMFrameScheduling.now,
  canHydrateInstance(
    instance: Instance | TextInstance,
    type: string,
    props: Props,
  ): boolean {
    return (
      instance.nodeType === ELEMENT_NODE &&
      type === instance.nodeName.toLowerCase()
    );
  },
  canHydrateTextInstance(
    instance: Instance | TextInstance,
    text: string,
  ): boolean {
    if (text === '') {
      
      return false;
    }
    return instance.nodeType === TEXT_NODE;