### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/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 feature request that matches the one I want to file, without success.

### Electron Version

12.0.5

### What operating system are you using?

Ubuntu

### Operating System Version

Ubuntu 21.04 x86_64 5.11.0-16-generic

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

All clicking inside the developer tool works well and not being interrupted by dragging the electron app.

### Actual Behavior

When I click the `option` and `close` tool inside the developer tool, it drags the electron app.

https://user-images.githubusercontent.com/61906684/118137437-666fd600-b42f-11eb-9443-ea1ebad1d0ec.mp4



### Testcase Gist URL

_No response_

### Additional Information

This bug only occurs if the dock position is on the left.
shell/browser/api/electron_api_browser_window.cc
if (api_web_contents_) {
    
    
    auto* host = web_contents()->GetRenderViewHost();
    if (host)
      host->GetWidget()->RemoveInputEventObserver(this);
    api_web_contents_->RemoveObserver(this);
    
    OnCloseContents();
  }
}
void BrowserWindow::OnInputEvent(const blink::WebInputEvent& event) {
  switch (event.GetType()) {
    case blink::WebInputEvent::Type::kGestureScrollBegin:
    case blink::WebInputEvent::Type::kGestureScrollUpdate:
    case blink::WebInputEvent::Type::kGestureScrollEnd:
      Emit("scroll-touch-edge");
      break;
    default:
      break;
  }
}
void BrowserWindow::RenderViewHostChanged(content::RenderViewHost* old_host,