* Electron version: 1.4.15
* Operating system: Windows 10

### Actual behavior

Height is oversized by exactly 8px consistently (taskbar is set to small icons).

![Alt](https://raw.githubusercontent.com/adi518/electron-frameless-maximize-test/master/issue.jpg)

### How to reproduce

https://github.com/adi518/electron-frameless-maximize-test
atom/browser/native_window_views.cc
menu_bar_alt_pressed_ = false;
    SetMenuBarVisibility(!menu_bar_visible_);
  } else {
    
    menu_bar_alt_pressed_ = false;
  }
}
void NativeWindowViews::Layout() {
#if defined(OS_WIN)
  
  
  if (!has_frame() && IsMaximized()) {
    gfx::Rect bounds = SubtractBorderSize(GetContentsBounds());
    web_view_->SetBoundsRect(bounds);
    return;
  }
#endif
  const auto size = GetContentsBounds().size();
  const auto menu_bar_bounds =
      menu_bar_ ? gfx::Rect(0, 0, size.width(), kMenuBarHeight) : gfx::Rect();
  if (menu_bar_) {
    menu_bar_->SetBoundsRect(menu_bar_bounds);
  }
  const auto old_web_view_size = web_view_ ? web_view_->size() : gfx::Size();
  if (web_view_) {
    web_view_->SetBoundsRect(
        gfx::Rect(0, menu_bar_bounds.height(), size.width(),
                  size.height() - menu_bar_bounds.height()));
  }