Remove docked windows entirely in M59.

ui/views/widget/native_widget_mac.mm

 // 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 "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <utility>
 
@@ skipping 402 matching lines @@
     return;
 
   switch (state) {
     case ui::SHOW_STATE_DEFAULT:
     case ui::SHOW_STATE_NORMAL:
     case ui::SHOW_STATE_INACTIVE:
       break;
     case ui::SHOW_STATE_MINIMIZED:
     case ui::SHOW_STATE_MAXIMIZED:
     case ui::SHOW_STATE_FULLSCREEN:
-    case ui::SHOW_STATE_DOCKED:
       NOTIMPLEMENTED();
       break;
     case ui::SHOW_STATE_END:
       NOTREACHED();
       break;
   }
   bridge_->SetVisibilityState(state == ui::SHOW_STATE_INACTIVE
       ? BridgedNativeWidget::SHOW_INACTIVE
       : BridgedNativeWidget::SHOW_AND_ACTIVATE_WINDOW);
 
@@ skipping 357 matching lines @@
   [[ViewsNSWindowCloseAnimator alloc] initWithWindow:window];
 }
 
 - (void)animationDidEnd:(NSAnimation*)animation {
   [window_ close];
   [animation_ setDelegate:nil];
   [self release];
 }
 
 @end