Found this issue on a project, tested against the electron-quick-start and found the problem still exists.

Simply adding "frame: false" to the new BrowserWindow() call will cause it.
- Electron version: 0.37.5
- Operating system: Windows

![capture](https://cloud.githubusercontent.com/assets/5051169/14453254/a38c177c-008b-11e6-9e80-97c6a95c816e.PNG)

atom/browser/native_window.cc
const CapturePageCallback& callback) {
  const auto view = web_contents()->GetRenderWidgetHostView();
  const auto host = view ? view->GetRenderWidgetHost() : nullptr;
  if (!view || !host) {
    callback.Run(SkBitmap());
    return;
  }
  
  const gfx::Size view_size = rect.IsEmpty() ? view->GetViewBounds().size() :
                                               rect.size();
  
  
  
  gfx::Size bitmap_size = view_size;
  const gfx::NativeView native_view = view->GetNativeView();
  gfx::Screen* const screen = gfx::Screen::GetScreenFor(native_view);
  const float scale =
      screen->GetDisplayNearestWindow(native_view).device_scale_factor();
  if (scale > 1.0f)
    bitmap_size = gfx::ScaleToCeiledSize(view_size, scale);
  host->CopyFromBackingStore(
      gfx::Rect(rect.origin(), view_size),
      bitmap_size,
      base::Bind(&NativeWindow::OnCapturePageDone,
                 weak_factory_.GetWeakPtr(),
                 callback),
      kBGRA_8888_SkColorType);
}
void NativeWindow::ShowDefinitionForSelection() {