Makes ViewManagerServiceImpl track a single root

mojo/services/view_manager/window_manager_access_policy.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 "mojo/services/view_manager/window_manager_access_policy.h"
 
 #include "mojo/services/view_manager/access_policy_delegate.h"
 #include "mojo/services/view_manager/server_view.h"
 
 namespace mojo {
@@ skipping 48 matching lines @@
 bool WindowManagerAccessPolicy::CanChangeViewVisibility(
     const ServerView* view) const {
   return view->id().connection_id == connection_id_;
 }
 
 bool WindowManagerAccessPolicy::CanSetViewSurfaceId(
     const ServerView* view) const {
   if (delegate_->IsViewRootOfAnotherConnectionForAccessPolicy(view))
     return false;
   return view->id().connection_id == connection_id_ ||
-         (delegate_->GetRootsForAccessPolicy().count(
-              ViewIdToTransportId(view->id())) > 0);
+         (delegate_->IsRootForAccessPolicy(view->id()));
 }
 
 bool WindowManagerAccessPolicy::CanSetViewBounds(const ServerView* view) const {
   return view->id().connection_id == connection_id_;
 }
 
 bool WindowManagerAccessPolicy::CanSetViewProperties(
     const ServerView* view) const {
   return view->id().connection_id == connection_id_;
 }
 
 bool WindowManagerAccessPolicy::ShouldNotifyOnHierarchyChange(
     const ServerView* view,
     const ServerView** new_parent,
     const ServerView** old_parent) const {
   // Notify if we've already told the window manager about the view, or if we've
   // already told the window manager about the parent. The later handles the
   // case of a view that wasn't parented to the root getting added to the root.
   return IsViewKnown(view) || (*new_parent && IsViewKnown(*new_parent));
 }
 
 bool WindowManagerAccessPolicy::IsViewKnown(const ServerView* view) const {
   return delegate_->IsViewKnownForAccessPolicy(view);
 }
 
 }  // namespace service
 }  // namespace mojo