* Electron version: 1.6.0, does _not_ repro in 1.4.x
* Operating system: Win32 tested, others possible

It appears that even if you create a window with `focusable: false` and `show: false`, calling `loadURL` on it will cause it to accept window focus and for other windows to lose focus.

### How to reproduce

Open the default Electron app

```js
BW = require('electron').remote.BrowserWindow
let ourWindow = BW.getFocusedWindow()
ourWindow.on('blur', () => console.log("Lost it!"))

hidden = new BW({show: false, width: 500, height: 500, focusable: false})
hidden.loadURL("http://www.yahoo.com")

>>> "Lost it!"
```

This breaks anyone using background windows for computation such as VS Code and Slack (via electron-remote), because whenever a background task kicks off, users can't type anymore
atom/browser/native_window_views.cc
return;
  if (!menu_bar_) {
    gfx::Size content_size = GetContentSize();
    menu_bar_.reset(new MenuBar(this));
    menu_bar_->set_owned_by_client();
    if (!menu_bar_autohide_) {
      SetMenuBarVisibility(true);
      if (use_content_size_) {
        
        extensions::SizeConstraints constraints = GetContentSizeConstraints();
        if (constraints.HasMinimumSize()) {
          gfx::Size min_size = constraints.GetMinimumSize();
          min_size.set_height(min_size.height() + kMenuBarHeight);
          constraints.set_minimum_size(min_size);
        }
        if (constraints.HasMaximumSize()) {
          gfx::Size max_size = constraints.GetMaximumSize();
          max_size.set_height(max_size.height() + kMenuBarHeight);
          constraints.set_maximum_size(max_size);
        }
        SetContentSizeConstraints(constraints);
        
        SetContentSize(content_size);
      }
    }
  }
  menu_bar_->SetMenu(menu_model);
  Layout();
}
void NativeWindowViews::SetParentWindow(NativeWindow* parent) {