### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a bug report that matches the one I want to file, without success.

### Electron Version

17, 18

### What operating system are you using?

Windows

### Operating System Version

Windows 10 19042.985

### What arch are you using?

x64

### Last Known Working Electron version

14

### Expected Behavior

No crash

### Actual Behavior

Electron crashes
![2022-04-21 10_07_53-Source Not Found (Debugging) - Microsoft Visual Studio](https://user-images.githubusercontent.com/10595986/164416772-c4800f31-d165-4639-88e3-23be25d8fe8c.png)

This does not happen consistently but fairly often and can be reproduced in the app.
I have not been able yet to make a small/standalone reproducable example

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
: ontents(contents) {}
  base::WeakPtr<WebContents> ontents;
};
const void* kElectronApiWebContentsKey = &kElectronApiWebContentsKey;
const char kRootName[] = "<root>";
struct FileSystem {
  FileSystem() = default;
  FileSystem(const std::string& type,
             const std::string& file_system_name,
             const std::string& root_url,
             const std::string& file_system_path)
      : type(type),
        file_system_name(file_system_name),
        root_url(root_url),
        file_system_path(file_system_path) {}
  std::string type;
  std::string file_system_name;
  std::string root_url;
  std::string file_system_path;
};
std::string RegisterFileSystem(content::WebContents* ontents,