Remove persisted docked windows

chrome/browser/ui/views/chrome_views_delegate.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/chrome_views_delegate.h"
 
 #include <memory>
 
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 213 matching lines @@
 
   std::unique_ptr<DictionaryPrefUpdate> pref_update =
       chrome::GetWindowPlacementDictionaryReadWrite(window_name, prefs);
   base::DictionaryValue* window_preferences = pref_update->Get();
   window_preferences->SetInteger("left", bounds.x());
   window_preferences->SetInteger("top", bounds.y());
   window_preferences->SetInteger("right", bounds.right());
   window_preferences->SetInteger("bottom", bounds.bottom());
   window_preferences->SetBoolean("maximized",
                                  show_state == ui::SHOW_STATE_MAXIMIZED);
+  // TODO(afakhry): Remove in M58.
   window_preferences->SetBoolean("docked", show_state == ui::SHOW_STATE_DOCKED);
+
   gfx::Rect work_area(display::Screen::GetScreen()
                           ->GetDisplayNearestWindow(window->GetNativeView())
                           .work_area());
   window_preferences->SetInteger("work_area_left", work_area.x());
   window_preferences->SetInteger("work_area_top", work_area.y());
   window_preferences->SetInteger("work_area_right", work_area.right());
   window_preferences->SetInteger("work_area_bottom", work_area.bottom());
 }
 
 bool ChromeViewsDelegate::GetSavedWindowPlacement(
@@ skipping 324 matching lines @@
   return ViewsDelegate::GetBubbleDialogMargins();
 }
 
 #if !defined(USE_ASH)
 views::Widget::InitParams::WindowOpacity
 ChromeViewsDelegate::GetOpacityForInitParams(
     const views::Widget::InitParams& params) {
   return views::Widget::InitParams::OPAQUE_WINDOW;
 }
 #endif