Remove docked windows entirely in M59.

ash/common/wm/fullscreen_window_finder.cc

 // Copyright 2016 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/fullscreen_window_finder.h"
 
 #include "ash/common/wm/switchable_windows.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ui/compositor/layer.h"
 
 namespace ash {
 namespace wm {
 
 WmWindow* GetWindowForFullscreenMode(WmWindow* context) {
   WmWindow* topmost_window = nullptr;
   WmWindow* active_window = context->GetShell()->GetActiveWindow();
   if (active_window &&
       active_window->GetRootWindow() == context->GetRootWindow() &&
       IsSwitchableContainer(active_window->GetParent())) {
     // Use the active window when it is on the current root window to determine
-    // the fullscreen state to allow temporarily using a panel or docked window
-    // (which are always above the default container) while a fullscreen
-    // window is open. We only use the active window when in a switchable
-    // container as the launcher should not exit fullscreen mode.
+    // the fullscreen state to allow temporarily using a panel (which is always
+    // above the default container) while a fullscreen window is open. We only
+    // use the active window when in a switchable container as the launcher
+    // should not exit fullscreen mode.
     topmost_window = active_window;
   } else {
     // Otherwise, use the topmost window on the root window's default container
     // when there is no active window on this root window.
     std::vector<WmWindow*> windows =
         context->GetRootWindow()
             ->GetChildByShellWindowId(kShellWindowId_DefaultContainer)
             ->GetChildren();
     for (auto iter = windows.rbegin(); iter != windows.rend(); ++iter) {
       if ((*iter)->GetWindowState()->IsUserPositionable() &&
           (*iter)->GetLayerTargetVisibility()) {
         topmost_window = *iter;
         break;
       }
     }
   }
   while (topmost_window) {
     if (topmost_window->GetWindowState()->IsFullscreen())
       return topmost_window;
     topmost_window = topmost_window->GetTransientParent();
   }
   return nullptr;
 }
 
 }  // namespace wm
 }  // namespace ash