### 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
auto new_view_size = view->size();
    new_view_size.set_width(new_view_size.width() + width_delta);
    new_view_size.set_height(new_view_size.height() + height_delta);
    view->SetSize(new_view_size);
  }
  auto new_view_bounds = view->bounds();
  if (flags & kAutoResizeHorizontal) {
    new_view_bounds.set_width(new_window.width() /
                              auto_horizontal_proportion_width_);
    new_view_bounds.set_x(new_window.width() /
                          auto_horizontal_proportion_left_);
  }
  if (flags & kAutoResizeVertical) {
    new_view_bounds.set_height(new_window.height() /
                               auto_vertical_proportion_height_);
    new_view_bounds.set_y(new_window.height() / auto_vertical_proportion_top_);
  }
  if ((flags & kAutoResizeHorizontal) || (flags & kAutoResizeVertical)) {
    view->SetBoundsRect(new_view_bounds);
  }
}
void NativeBrowserViewViews::ResetAutoResizeProportions() {
  if (auto_resize_flags_ & AutoResizeFlags::kAutoResizeHorizontal) {
    auto_horizontal_proportion_set_ = false;
  }
  if (auto_resize_flags_ & AutoResizeFlags::kAutoResizeVertical) {
    auto_vertical_proportion_set_ = false;
  }
}
void NativeBrowserViewViews::SetBounds(const gfx::Rect& bounds) {