Remove persisted docked windows

chrome/browser/ui/views/chrome_views_delegate.cc

Index: chrome/browser/ui/views/chrome_views_delegate.cc
diff --git a/chrome/browser/ui/views/chrome_views_delegate.cc b/chrome/browser/ui/views/chrome_views_delegate.cc
index 5c3e141a8753b115f1647c87d847e581d4a42392..96f14b1e5e8cb7e254ffe4a62e89f2e160e8a484 100644
--- a/chrome/browser/ui/views/chrome_views_delegate.cc
+++ b/chrome/browser/ui/views/chrome_views_delegate.cc
@@ -231,7 +231,9 @@ void ChromeViewsDelegate::SaveWindowPlacement(const views::Widget* window,
   window_preferences->SetInteger("bottom", bounds.bottom());
   window_preferences->SetBoolean("maximized",
                                  show_state == ui::SHOW_STATE_MAXIMIZED);
+  // TODO(afakhry): Remove Docked Windows in M58.
   window_preferences->SetBoolean("docked", show_state == ui::SHOW_STATE_DOCKED);
+
   gfx::Rect work_area(display::Screen::GetScreen()
                           ->GetDisplayNearestWindow(window->GetNativeView())
                           .work_area());