Remove docked windows entirely in M59.

ash/common/wm/drag_details.cc

 // 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.
 
 #include "ash/common/wm/drag_details.h"
 
 #include "ash/common/wm/window_resizer.h"
 #include "ash/common/wm_window.h"
 #include "ash/common/wm_window_property.h"
 #include "ui/base/hit_test.h"
@@ skipping 50 matching lines @@
           WindowResizer::GetPositionChangeDirectionForWindowComponent(
               window_component)),
       size_change_direction(
           GetSizeChangeDirectionForWindowComponent(window_component)),
       is_resizable(bounds_change != WindowResizer::kBoundsChangeDirection_None),
       source(source),
       should_attach_to_shelf(
           window->GetType() == ui::wm::WINDOW_TYPE_PANEL &&
           window->GetBoolProperty(WmWindowProperty::PANEL_ATTACHED)) {
   wm::WindowState* window_state = window->GetWindowState();
-  if ((window_state->IsNormalOrSnapped() || window_state->IsDocked()) &&
-      window_state->HasRestoreBounds() && window_component == HTCAPTION) {
+  if (window_state->IsNormalOrSnapped() && window_state->HasRestoreBounds() &&
+      window_component == HTCAPTION) {
     restore_bounds = window_state->GetRestoreBoundsInScreen();
   }
 }
 
 DragDetails::~DragDetails() {}
 
 }  // namespace ash