We purge it [here](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L88-L89) but this code doesn’t run because of the [early exit](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L53-L57).

Need to fix this and add a test case to make sure we don’t regress on it.

displayName: 'Foo',
        children: [{
          displayName: 'Bar',
          ownerDisplayName: 'Foo',
          children: [{
            displayName: 'div',
            ownerDisplayName: 'Bar',
            children: [{
              displayName: 'h1',
              ownerDisplayName: 'Foo',
              children: [{
                displayName: '#text',
                text: 'Hi.',
              }],
            }, {
              displayName: '#text',
              text: ' Mom',
            }],
          }],
        }],
      }],
    };
    assertTreeMatches([element, tree], {includeOwnerDisplayName: true});
  });
  it('preserves unmounted components until purge', () => {
    var node = document.createElement('div');
    var renderBar = true;
    var fooInstance;
    var barInstance;
    class Foo extends React.Component {