Remove docked windows entirely in M59.

ash/common/wm/dock/dock_types.h

-// Copyright (c) 2013 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.
-
-#ifndef ASH_COMMON_WM_DOCK_DOCK_TYPES_H_
-#define ASH_COMMON_WM_DOCK_DOCK_TYPES_H_
-
-namespace ash {
-
-// Possible values of which side of the screen the windows are docked at.
-// This is used by DockedwindowLayoutManager and DockedWindowResizer to
-// implement docking behavior including magnetism while dragging windows into
-// or out of the docked windows area.
-enum DockedAlignment {
-  // No docked windows.
-  DOCKED_ALIGNMENT_NONE,
-
-  // Some windows are already docked on the left side of the screen.
-  DOCKED_ALIGNMENT_LEFT,
-
-  // Some windows are already docked on the right side of the screen.
-  DOCKED_ALIGNMENT_RIGHT,
-};
-
-// User action recorded for use in UMA histograms.
-enum DockedAction {
-  DOCKED_ACTION_NONE,      // Regular drag of undocked window. Not recorded.
-  DOCKED_ACTION_DOCK,      // Dragged and docked a window.
-  DOCKED_ACTION_UNDOCK,    // Dragged and undocked a window.
-  DOCKED_ACTION_RESIZE,    // Resized a docked window.
-  DOCKED_ACTION_REORDER,   // Possibly reordered docked windows.
-  DOCKED_ACTION_EVICT,     // A docked window could not stay docked.
-  DOCKED_ACTION_MAXIMIZE,  // Maximized a docked window.
-  DOCKED_ACTION_MINIMIZE,  // Minimized a docked window.
-  DOCKED_ACTION_RESTORE,   // Restored a docked window that was minimized.
-  DOCKED_ACTION_CLOSE,     // Closed a window while it was docked.
-  DOCKED_ACTION_COUNT,     // Maximum value of this enum for histograms use.
-};
-
-// Event source for the docking user action (when known).
-enum DockedActionSource {
-  DOCKED_ACTION_SOURCE_UNKNOWN,
-  DOCKED_ACTION_SOURCE_MOUSE,
-  DOCKED_ACTION_SOURCE_TOUCH,
-  DOCKED_ACTION_SOURCE_KEYBOARD,
-
-  // Maximum value of this enum for histograms use.
-  DOCKED_ACTION_SOURCE_COUNT,
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_DOCK_DOCK_TYPES_H_