**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`
expect(option.selected).toBe(expectedValue);
        });
      };
      itRenders('a select with a value and an onChange', async render => {
        const e = await render(
          <select value="bar" onChange={() => {}}>{options}</select>,
        );
        expectSelectValue(e, 'bar');
      });
      itRenders('a select with a value and readOnly', async render => {
        const e = await render(
          <select value="bar" readOnly={true}>{options}</select>,
        );
        expectSelectValue(e, 'bar');
      });
      itRenders(
        'a select with a multiple values and an onChange',
        async render => {
          const e = await render(
            <select value={['bar', 'baz']} multiple={true} onChange={() => {}}>
              {options}
            </select>,
          );
          expectSelectValue(e, ['bar', 'baz']);
        },
      );
      itRenders(
        'a select with a multiple values and readOnly',
        async render => {
          const e = await render(