## Details
Using version 4.0.2 (8/15/2019) I am getting a maximum call stack size exceeded when my app starts up. While my app using this is a little different I have replicated the issue using a fresh create-react-app. I will include the App.js code below.

## Steps to reproduce
1. Create a new app using version 3.0.1 of create-react-app
2. Replace the code in App.js with the code listed below
3. Inspect the console, there should be a stack trace from a maximum call stack exceeded error

## App.js
```
import React from 'react';
import logo from './logo.svg';
import './App.css';

const createDivs = num => {
    const rtn = [];
    for(let i = 0; i < num; i++) {
        const key = `div-${i}`;
        rtn.push(<div className={key} key={key} />)
    }
    return rtn;
}

function App() {
  return (
    <div className="App">
      <header className="App-header">
        <img src={logo} className="App-logo" alt="logo" />
        <p>
          Edit <code>src/App.js</code> and save to reload.
        </p>
        <a
          className="App-link"
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
        >
          Learn React
        </a>
      </header>
      <div>
        {createDivs(15000)}
      </div>
    </div>
  );
}

export default App;
```

## Call Stack
<details>

<summary>backend.js:formatted:2097 Uncaught RangeError: Maximum call stack size exceeded
</summary>

```
    at ge (backend.js:formatted:2097)
    at Ge (backend.js:formatted:2435)
    at Ge (backend.js:formatted:2478)
    at Ge (backend.js:formatted:2478)
    at Ge (backend.js:formatted:2478)
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    at Ge (backend.js:formatted:2478)
ge @ backend.js:formatted:2097
Ge @ backend.js:formatted:2435
Ge @ backend.js:formatted:2478
Ge @ backend.js:formatted:2478
Ge @ backend.js:formatted:2478
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postMessage (async)
r @ contentScript.js:1
88 @ contentScript.js:1
n @ contentScript.js:1
(anonymous) @ contentScript.js:1
(anonymous) @ contentScript.js:1
Show 170 more frames
```

</details>

This was not an issue in the previous version of react-devtools.
if (fiberToErrorsMap.has(id)) {
      fiberToErrorsMap.delete(id);
      fibersWithChangedErrorOrWarningCounts.add(id);
      flushPendingEvents();
    }
    updateMostRecentlyInspectedElementIfNecessary(id);
  }
  function clearWarningsForFiberID(id: number) {
    if (fiberToWarningsMap.has(id)) {
      fiberToWarningsMap.delete(id);
      fibersWithChangedErrorOrWarningCounts.add(id);
      flushPendingEvents();
    }
    updateMostRecentlyInspectedElementIfNecessary(id);
  }
  function updateMostRecentlyInspectedElementIfNecessary(