* Electron Version: v2.0.1
* Operating System (Platform and Version): windows10
* Last known working Electron version: 1.7.9

Allow frameless transparent windows to be sized smaller than 64x64 on Windows #12923

but，now, it can't bigger than 64x64 on Windows
my `height/width` don't work
when i set `frame: true`, it can't resize
remove `transparent: true`, all work right
![2018-05-18 11_14_17](https://user-images.githubusercontent.com/12164900/40214332-aac2815e-5a8c-11e8-8aa1-38ec2a427e0a.gif)

atom/browser/native_window.cc
extensions::SizeConstraints content_constraints = GetContentSizeConstraints();
  extensions::SizeConstraints window_constraints;
  if (content_constraints.HasMaximumSize()) {
    gfx::Rect max_bounds = ContentBoundsToWindowBounds(
        gfx::Rect(content_constraints.GetMaximumSize()));
    window_constraints.set_maximum_size(max_bounds.size());
  }
  if (content_constraints.HasMinimumSize()) {
    gfx::Rect min_bounds = ContentBoundsToWindowBounds(
        gfx::Rect(content_constraints.GetMinimumSize()));
    window_constraints.set_minimum_size(min_bounds.size());
  }
  return window_constraints;
}
void NativeWindow::SetContentSizeConstraints(
    const extensions::SizeConstraints& size_constraints) {
  size_constraints_ = size_constraints;
}
extensions::SizeConstraints NativeWindow::GetContentSizeConstraints() const {
  return size_constraints_;
}
void NativeWindow::SetMinimumSize(const gfx::Size& size) {
  extensions::SizeConstraints size_constraints;
  size_constraints.set_minimum_size(size);
  SetSizeConstraints(size_constraints);
}
gfx::Size NativeWindow::GetMinimumSize() const {