Remove docked windows entirely in M59.

ash/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 # Historical note: Ash shipped on Windows for a couple years to support
@@ skipping 447 matching lines @@
     "common/wallpaper/wallpaper_widget_controller.cc",
     "common/wallpaper/wallpaper_widget_controller.h",
     "common/wm/always_on_top_controller.cc",
     "common/wm/always_on_top_controller.h",
     "common/wm/container_finder.cc",
     "common/wm/container_finder.h",
     "common/wm/default_state.cc",
     "common/wm/default_state.h",
     "common/wm/default_window_resizer.cc",
     "common/wm/default_window_resizer.h",
-    "common/wm/dock/docked_window_layout_manager.cc",
-    "common/wm/dock/docked_window_layout_manager.h",
-    "common/wm/dock/docked_window_layout_manager_observer.h",
-    "common/wm/dock/docked_window_resizer.cc",
-    "common/wm/dock/docked_window_resizer.h",
     "common/wm/drag_details.cc",
     "common/wm/drag_details.h",
     "common/wm/focus_rules.cc",
     "common/wm/focus_rules.h",
     "common/wm/fullscreen_window_finder.cc",
     "common/wm/fullscreen_window_finder.h",
     "common/wm/immersive_context_ash.cc",
     "common/wm/immersive_context_ash.h",
     "common/wm/lock_layout_manager.cc",
     "common/wm/lock_layout_manager.h",
@@ skipping 778 matching lines @@
     "test/ash_test_environment_default.cc",
     "test/ash_test_helper_unittest.cc",
     "test/ash_unittests.cc",
     "tooltips/tooltip_controller_unittest.cc",
     "touch/touch_observer_hud_unittest.cc",
     "utility/screenshot_controller_unittest.cc",
     "virtual_keyboard_controller_unittest.cc",
     "wm/always_on_top_controller_unittest.cc",
     "wm/ash_focus_rules_unittest.cc",
     "wm/ash_native_cursor_manager_unittest.cc",
-    "wm/dock/docked_window_layout_manager_unittest.cc",
-    "wm/dock/docked_window_resizer_unittest.cc",
     "wm/drag_window_resizer_unittest.cc",
     "wm/gestures/overview_gesture_handler_unittest.cc",
     "wm/immersive_fullscreen_controller_unittest.cc",
     "wm/lock_layout_manager_unittest.cc",
     "wm/lock_state_controller_unittest.cc",
     "wm/maximize_mode/accelerometer_test_data_literals.cc",
     "wm/maximize_mode/maximize_mode_controller_unittest.cc",
     "wm/maximize_mode/maximize_mode_window_manager_unittest.cc",
     "wm/overlay_event_filter_unittest.cc",
     "wm/overview/window_selector_unittest.cc",
@@ skipping 126 matching lines @@
     "//content/public/app:both",
     "//device/bluetooth",
   ]
 
   data_deps = [
     "//ash/common/strings:ash_test_strings",
     "//ash/resources:ash_test_resources_with_content_100_percent",
     "//ash/resources:ash_test_resources_200_percent",
   ]
 }