### 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

v14.0.0-nightly.20210426

### What operating system are you using?

Windows

### Operating System Version

Windows 10

### What arch are you using?

x64

### Last Known Working Electron version

v14.0.0-nightly.20210413

### Expected Behavior

`BrowserViews` load their `webContents`

### Actual Behavior

BrowserViews will not load `webContents` properly.

### Testcase Gist URL

https://gist.github.com/712a2fde2757736c9dbf6c3e7e0aa18b

### Additional Information

Bisected range: https://github.com/electron/electron/compare/v14.0.0-nightly.20210413...v14.0.0-nightly.20210426
shell/browser/native_browser_view_views.cc
InspectableWebContents* inspectable_web_contents)
    : NativeBrowserView(inspectable_web_contents) {}
NativeBrowserViewViews::~NativeBrowserViewViews() = default;
void NativeBrowserViewViews::SetAutoResizeFlags(uint8_t flags) {
  auto_resize_flags_ = flags;
  ResetAutoResizeProportions();
}
void NativeBrowserViewViews::UpdateDraggableRegions(
    const std::vector<mojom::DraggableRegionPtr>& regions) {
  
  
  
  
  
  
  
  auto const offset = GetBounds().OffsetFromOrigin();
  auto snapped_regions = mojo::Clone(regions);
  for (auto& snapped_region : snapped_regions) {
    snapped_region->bounds.Offset(offset);
  }
  draggable_region_ = DraggableRegionsToSkRegion(snapped_regions);
}
void NativeBrowserViewViews::SetAutoResizeProportions(