Alf Eaton 1760d93fc4 Upgrade React to v17 (#4201)
* Upgrade react and react-dom
* Fix test
* Ensure that the "history:toggle" event is broadcast when switching in or out of history view
* Add ControlledDropdown
* Remove DropdownButton stories

GitOrigin-RevId: 3810f6986bb60e59af31f960f431c31be16554f5
2021-06-19 02:08:29 +00:00
2021-06-19 02:08:29 +00:00
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