Makes WindowTree take the AccessPolicy

components/mus/ws/default_access_policy.h

 // 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.
 
 #ifndef COMPONENTS_MUS_WS_DEFAULT_ACCESS_POLICY_H_
 #define COMPONENTS_MUS_WS_DEFAULT_ACCESS_POLICY_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "components/mus/ws/access_policy.h"
 
 namespace mus {
 namespace ws {
 
 class AccessPolicyDelegate;
 
 // AccessPolicy for all connections, except the window manager.
 class DefaultAccessPolicy : public AccessPolicy {
  public:
-  DefaultAccessPolicy(ConnectionSpecificId connection_id,
-                      AccessPolicyDelegate* delegate);
+  DefaultAccessPolicy();
   ~DefaultAccessPolicy() override;
 
   // AccessPolicy:
+  void Init(ConnectionSpecificId connection_id,
+            AccessPolicyDelegate* delegate) override;
   bool CanRemoveWindowFromParent(const ServerWindow* window) const override;
   bool CanAddWindow(const ServerWindow* parent,
                     const ServerWindow* child) const override;
   bool CanAddTransientWindow(const ServerWindow* parent,
                              const ServerWindow* child) const override;
   bool CanRemoveTransientWindowFromParent(
       const ServerWindow* window) const override;
   bool CanSetModal(const ServerWindow* window) const override;
   bool CanReorderWindow(const ServerWindow* window,
                         const ServerWindow* relative_window,
@@ skipping 18 matching lines @@
       const ServerWindow** new_parent,
       const ServerWindow** old_parent) const override;
   const ServerWindow* GetWindowForFocusChange(
       const ServerWindow* focused) override;
   bool CanSetWindowManager() const override;
   bool IsValidIdForNewWindow(const ClientWindowId& id) const override;
 
  private:
   bool WasCreatedByThisConnection(const ServerWindow* window) const;
 
-  const ConnectionSpecificId connection_id_;
-  AccessPolicyDelegate* delegate_;
+  ConnectionSpecificId connection_id_ = 0u;
+  AccessPolicyDelegate* delegate_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultAccessPolicy);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_DEFAULT_ACCESS_POLICY_H_