* **Electron Version:**
  4.0.2
* **Operating System:**
  macOS 10.14.3
* **Last Known Working Electron version:**:
  1.7

### Expected Behavior
When creating a BrowserWindow it should not appear in the dock menu by defaults.

### Actual Behavior
It appears in the dock menu (example: `raven` in https://electronjs.org/docs/tutorial/macos-dock)

### To Reproduce
Just create new BrowserWindow, then right click on the app icon in the dock. (see https://electronjs.org/docs/tutorial/macos-dock)

At least it should be a way to control that, this can be achieve for top level window with:
`[window_ setExcludedFromWindowsMenu:YES];`, indeed [window isExcludedFromWindowsMenu] returns false by default, see

https://developer.apple.com/documentation/appkit/nsapplication/1428625-removewindowsitem
`Use the isExcludedFromWindowsMenu method of NSWindow if you want the item to remain excluded from the Window menu.`
https://developer.apple.com/documentation/appkit/nswindow/1419175-isexcludedfromwindowsmenu

atom/browser/api/atom_api_top_level_window.cc
window_->Unmaximize();
}
bool TopLevelWindow::IsMaximized() {
  return window_->IsMaximized();
}
void TopLevelWindow::Minimize() {
  window_->Minimize();
}
void TopLevelWindow::Restore() {
  window_->Restore();
}
bool TopLevelWindow::IsMinimized() {
  return window_->IsMinimized();
}
void TopLevelWindow::SetFullScreen(bool fullscreen) {
  window_->SetFullScreen(fullscreen);
}
bool TopLevelWindow::IsFullscreen() {
  return window_->IsFullscreen();
}
void TopLevelWindow::SetBounds(const gfx::Rect& bounds, mate::Arguments* args) {
  bool animate = false;
  args->GetNext(&animate);
  window_->SetBounds(bounds, animate);
}
gfx::Rect TopLevelWindow::GetBounds() {
  return window_->GetBounds();
}
bool TopLevelWindow::IsNormal() {