views/mus: Set-up transient windows correctly.

components/mus/public/cpp/lib/window.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 "components/mus/public/cpp/window.h"
 
 #include <set>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 252 matching lines @@
   // TODO(beng): not necessarily valid to all connections, but possibly to the
   //             embeddee in an embedder-embeddee relationship.
   if (connection_)
     CHECK_EQ(child->connection(), connection_);
   LocalRemoveChild(child);
   if (connection_)
     tree_client()->RemoveChild(child->id(), id_);
 }
 
 void Window::AddTransientWindow(Window* transient_window) {
-  if (connection_)
-    CHECK_EQ(transient_window->connection(), connection_);
   LocalAddTransientWindow(transient_window);
   if (connection_)
     tree_client()->AddTransientWindow(this, transient_window->id());
 }
 
 void Window::RemoveTransientWindow(Window* transient_window) {
-  if (connection_)
-    CHECK_EQ(transient_window->connection(), connection_);
   LocalRemoveTransientWindow(transient_window);
   if (connection_)
     tree_client()->RemoveTransientWindowFromParent(transient_window);
 }
 
 void Window::MoveToFront() {
   if (!parent_ || parent_->children_.back() == this)
     return;
   Reorder(parent_->children_.back(), mojom::ORDER_DIRECTION_ABOVE);
 }
@@ skipping 473 matching lines @@
     notifier->NotifyWindowReordered();
 
   return true;
 }
 
 // static
 Window** Window::GetStackingTarget(Window* window) {
   return &window->stacking_target_;
 }
 }  // namespace mus